WIP add system locale detection

Signed-off-by: Terry Yiu <git@tyiu.xyz>

Cargo.lock

@@ -3517,6 +3517,7 @@ dependencies = [
  "sha2",
  "strum",
  "strum_macros",
+ "sys-locale",
  "tempfile",
  "thiserror 2.0.12",
  "tokenator",
@@ -5721,6 +5722,15 @@ dependencies = [
  "syn 2.0.104",
 ]
 
+[[package]]
+name = "sys-locale"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8eab9a99a024a169fe8a903cf9d4a3b3601109bcc13bd9e3c6fff259138626c4"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "sysinfo"
 version = "0.30.13"

Cargo.toml

@@ -69,6 +69,7 @@ tracing-appender = "0.2.3"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tempfile = "3.13.0"
 unic-langid = { version = "0.9.6", features = ["macros"] }
+sys-locale = "0.3"
 url = "2.5.2"
 urlencoding = "2.1.3"
 uuid = { version = "1.10.0", features = ["v4"] }

assets/translations/en-US/main.ftl

@@ -241,9 +241,6 @@ Enter_your_public_key__npub___nostr_address__e_g___address____or_private_key__ns
 # Label for find user button
 Find_User_bd12 = Find User
 
-# Label for font size, Appearance settings section
-Font_size_dd73 = Font size:
-
 # Title for hashtags column
 Hashtags_f8e0 = Hashtags
 
@@ -355,9 +352,6 @@ Notifications_ef56 = Notifications
 # Relative time for very recent events (less than 3 seconds)
 now_2181 = now
 
-# Setting to turn on sorting replies so that the newest are shown first
-On_f412 = On
-
 # Button label to open email client
 Open_Email_25e9 = Open Email
 
@@ -436,9 +430,6 @@ Repost_this_note_8e56 = Repost this note
 # Label for reposted notes
 Reposted_61c8 = Reposted
 
-# Label for reset note body font size, Appearance settings section
-Reset_4e60 = Reset
-
 # Label for reset zoom level, Appearance settings section
 Reset_62d4 = Reset
 
@@ -478,6 +469,9 @@ Send_1ea4 = Send
 # Column title for app settings
 Settings_7a4f = Settings
 
+# Label for Show source client, others settings section
+Show_source_client_9e31 = Show source client
+
 # Description for last note per user column
 Show_the_last_note_for_each_user_from_a_list_50e7 = Show the last note for each user from a list
 
@@ -490,12 +484,6 @@ Someone_else_s_Notes_7e5f = Someone else's Notes
 # Title for someone else's notifications column
 Someone_else_s_Notifications_82e6 = Someone else's Notifications
 
-# Label for Sort replies newest first, others settings section
-Sort_replies_newest_first_b6c3 = Sort replies newest first:
-
-# Label for Source client, others settings section
-Source_client_fb2b = Source client:
-
 # Description for contact list column
 Source_the_last_note_for_each_user_in_your_contact_list_e157 = Source the last note for each user in your contact list
 
@@ -532,9 +520,6 @@ Subscribe_to_someone_else_s_notes_d1e9 = Subscribe to someone else's notes
 # Column title for subscribing to individual user
 Subscribe_to_someone_s_notes_b3c8 = Subscribe to someone's notes
 
-# Support email address
-Support_email_44d9 = Support email:
-
 # Hover text for dark mode toggle button
 Switch_to_dark_mode_4dec = Switch to dark mode
 
@@ -575,7 +560,7 @@ username___at___domain___will_be_used_for_identification_a4fd = "{$username}" at
 Username_daa7 = Username
 
 # Label for view folder button, Storage settings section
-View_folder_9742 = View folder
+View_folder_9742 = View folder:
 
 # Column title for wallet management
 Wallet_5e50 = Wallet

assets/translations/en-XA/main.ftl

@@ -241,9 +241,6 @@ Enter_your_public_key__npub___nostr_address__e_g___address____or_private_key__ns
 # Label for find user button
 Find_User_bd12 = {"["}Fíñd Úsér{"]"}
 
-# Label for font size, Appearance settings section
-Font_size_dd73 = {"["}Fóñt sízé:{"]"}
-
 # Title for hashtags column
 Hashtags_f8e0 = {"["}Hàshtàgs{"]"}
 
@@ -355,9 +352,6 @@ Notifications_ef56 = {"["}Ñótífíçàtíóñs{"]"}
 # Relative time for very recent events (less than 3 seconds)
 now_2181 = {"["}ñów{"]"}
 
-# Setting to turn on sorting replies so that the newest are shown first
-On_f412 = {"["}Óñ{"]"}
-
 # Button label to open email client
 Open_Email_25e9 = {"["}Ópéñ Émàíl{"]"}
 
@@ -436,9 +430,6 @@ Repost_this_note_8e56 = {"["}Répóst thís ñóté{"]"}
 # Label for reposted notes
 Reposted_61c8 = {"["}Répóstéd{"]"}
 
-# Label for reset note body font size, Appearance settings section
-Reset_4e60 = {"["}Rését{"]"}
-
 # Label for reset zoom level, Appearance settings section
 Reset_62d4 = {"["}Rését{"]"}
 
@@ -478,6 +469,9 @@ Send_1ea4 = {"["}Séñd{"]"}
 # Column title for app settings
 Settings_7a4f = {"["}Séttíñgs{"]"}
 
+# Label for Show source client, others settings section
+Show_source_client_9e31 = {"["}Shów sóúrçé çlíéñt{"]"}
+
 # Description for last note per user column
 Show_the_last_note_for_each_user_from_a_list_50e7 = {"["}Shów thé làst ñóté fór éàçh úsér fróm à líst{"]"}
 
@@ -490,12 +484,6 @@ Someone_else_s_Notes_7e5f = {"["}Sóméóñé élsé's Ñótés{"]"}
 # Title for someone else's notifications column
 Someone_else_s_Notifications_82e6 = {"["}Sóméóñé élsé's Ñótífíçàtíóñs{"]"}
 
-# Label for Sort replies newest first, others settings section
-Sort_replies_newest_first_b6c3 = {"["}Sórt réplíés ñéwést fírst:{"]"}
-
-# Label for Source client, others settings section
-Source_client_fb2b = {"["}Sóúrçé çlíéñt:{"]"}
-
 # Description for contact list column
 Source_the_last_note_for_each_user_in_your_contact_list_e157 = {"["}Sóúrçé thé làst ñóté fór éàçh úsér íñ yóúr çóñtàçt líst{"]"}
 
@@ -532,9 +520,6 @@ Subscribe_to_someone_else_s_notes_d1e9 = {"["}Súbsçríbé tó sóméóñé él
 # Column title for subscribing to individual user
 Subscribe_to_someone_s_notes_b3c8 = {"["}Súbsçríbé tó sóméóñé's ñótés{"]"}
 
-# Support email address
-Support_email_44d9 = {"["}Súppórt émàíl:{"]"}
-
 # Hover text for dark mode toggle button
 Switch_to_dark_mode_4dec = {"["}Swítçh tó dàrk módé{"]"}
 
@@ -575,7 +560,7 @@ username___at___domain___will_be_used_for_identification_a4fd = {"["}"{$username
 Username_daa7 = {"["}Úsérñàmé{"]"}
 
 # Label for view folder button, Storage settings section
-View_folder_9742 = {"["}Víéw fóldér{"]"}
+View_folder_9742 = {"["}Víéw fóldér:{"]"}
 
 # Column title for wallet management
 Wallet_5e50 = {"["}Wàllét{"]"}

assets/translations/es-419/main.ftl

@@ -45,8 +45,6 @@ Algo_2452 = Algo
 Algorithmic_feeds_to_aid_in_note_discovery_d344 = Feeds algorítmicos para ayudar en el descubrimiento de notas
 # Label for zap amount input field
 Amount_70f0 = Cantidad
-# Label for appearance settings section
-Appearance_4c7f = Aspecto
 # Button to send message to Dave AI assistant
 Ask_b7f4 = Preguntar
 # Placeholder text for Dave AI input field
@@ -55,26 +53,16 @@ Ask_dave_anything_33d1 = Pregúntale cualquier cosa a Dave...
 Banner_52ef = Banner
 # Beta version label
 BETA_8e5d = BETA
-# Option in settings section to show the source client label at the bottom of the note
-Bottom_33c8 = Parte inferior
 # Broadcast the note to all connected relays
 Broadcast_fe43 = Transmitir
 # Broadcast the note only to local network relays
 Broadcast_Local_7e50 = Transmitir localmente
 # Button label to cancel an action
 Cancel_ed3b = Cancelar
-# Label for cancel clear cache, Storage settings section
-Cancel_fd8b = Cancelar
-# Label for clear cache button, Storage settings section
-Clear_cache_dccb = Limpiar caché
 # Hover text for editable zap amount
 Click_to_edit_0414 = Haz clic para editar
 # Column title for note composition
 Compose_Note_c094 = Redactar nota
-# Label for configure relays, settings section
-Configure_relays_d156 = Configurar relés
-# Label for confirm clear cache, Storage settings section
-Confirm_9d9d = Confirmar
 # Button label to confirm an action
 Confirm_f8a6 = Confirmar
 # Status label for connected relay
@@ -123,8 +111,6 @@ Custom_a69e = Personalizado
 Customize_Zap_Amount_cfc4 = Personalizar cantidad de zap
 # Column title for support page
 Damus_Support_27c0 = Ayuda de Damus
-# Label for Theme Dark, Appearance settings section
-Dark_85fe = Oscuro
 # Label for deck name input field
 Deck_name_cd32 = Nombre del deck
 # Label for decks section in side panel
@@ -165,14 +151,10 @@ Enter_your_public_key__npub___nostr_address__e_g___address____or_private_key__ns
 Find_User_bd12 = Buscar usuario
 # Title for hashtags column
 Hashtags_f8e0 = Hashtags
-# Option in settings section to hide the source client label in note display
-Hide_281d = Ocultar
 # Title for Home column
 Home_8c19 = Inicio
 # Label for deck icon selection
 Icon_b0ab = Ícono
-# Label for Image cache size, Storage settings section
-Image_cache_size_3004 = Tamaño de caché de imágenes:
 # Title for individual user column
 Individual_b776 = Individual
 # Error message for invalid zap amount
@@ -193,12 +175,8 @@ k_50K_c2dc = 50.000
 k_5K_f7e6 = 5.000
 # Description for your notes column
 Keep_track_of_your_notes___replies_a334 = Haz seguimiento de tus notas y respuestas
-# Label for language, Appearance settings section
-Language_e264 = Idioma:
 # Title for last note per user column
 Last_Note_per_User_17ad = Última nota por usuario
-# Label for Theme Light, Appearance settings section
-Light_7475 = Claro
 # Bitcoin Lightning network address field label
 Lightning_network_address__lud16_ea51 = Dirección de la red Lightning (lud16)
 # Login page title
@@ -241,8 +219,6 @@ now_2181 = ahora
 Open_Email_25e9 = Abrir correo electrónico
 # Instruction to open email client
 Open_your_default_email_client_to_get_help_from_the_Damus_team_68dc = Abre tu cliente de correo predeterminado para recibir ayuda del equipo de Damus
-# Label for others settings section
-Others_7267 = Otros
 # Placeholder text for NWC URI input
 Paste_your_NWC_URI_here_b471 = Pega tu NWC URI aquí...
 # Error message for missing deck name
@@ -289,8 +265,6 @@ replying_to_a_note_e0bc = respondiendo a una nota
 Repost_this_note_8e56 = Volver a publicar esta nota
 # Label for reposted notes
 Reposted_61c8 = Publicadas de nuevo
-# Label for reset zoom level, Appearance settings section
-Reset_62d4 = Restablecer
 # Heading for support section
 Running_into_a_bug_1796 = ¿Encontraste un error?
 # Label for satoshis (Bitcoin unit) for custom zap amount input field
@@ -313,10 +287,6 @@ See_notes_from_your_contacts_ac16 = Ver notas de tus contactos
 See_the_whole_nostr_universe_7694 = Ver todo el universo de nostr
 # Button label to send a zap
 Send_1ea4 = Enviar
-# Column title for app settings
-Settings_7a4f = Configuración
-# Label for Show source client, others settings section
-Show_source_client_9e31 = Mostrar cliente de origen
 # Description for last note per user column
 Show_the_last_note_for_each_user_from_a_list_50e7 = Mostrar la última nota para cada usuario de una lista
 # Button label to sign out of account
@@ -343,8 +313,6 @@ Stay_up_to_date_with_your_notifications_and_mentions_e73e = Mantente al día con
 Step_1_8656 = Paso 1
 # Step 2 label in support instructions
 Step_2_d08d = Paso 2
-# Label for storage settings section
-Storage_ed65 = Almacenamiento
 # Column title for subscribing to external user
 Subscribe_to_someone_else_s_notes_d1e9 = Suscribirse a las notas de otra persona
 # Column title for subscribing to individual user
@@ -357,14 +325,10 @@ Switch_to_light_mode_72ce = Cambiar a modo claro
 Tap_to_Load_4b05 = Toca para cargar
 # Message shown when Dave trial period has ended
 The_Dave_Nostr_AI_assistant_trial_has_ended_____Thanks_for_testing__Zap-enabled_Dave_coming_soon_c6c7 = La prueba del asistente de IA Dave de Nostr finalizó :(. ¡Gracias por probarlo! ¡Dave con zaps estará disponible muy pronto!
-# Label for theme, Appearance settings section
-Theme_4aac = Tema:
 # Column title for note thread view
 Thread_0f20 = Conversación
 # Link text for thread references
 thread_ad1f = conversación
-# Option in settings section to show the source client label at the top of the note
-Top_6aeb = Parte superior
 # Title for universe column
 Universe_e01e = Universo
 # Column title for universe feed
@@ -375,8 +339,6 @@ Use_this_wallet_for_the_current_account_only_61dc = Usar esta billetera solo par
 username___at___domain___will_be_used_for_identification_a4fd = Se utilizará "{ $username }" en "{ $domain }" para la identificación
 # Profile username field label
 Username_daa7 = Nombre de usuario
-# Label for view folder button, Storage settings section
-View_folder_9742 = Ver carpeta
 # Column title for wallet management
 Wallet_5e50 = Billetera
 # Hint for deck name input field
@@ -395,8 +357,6 @@ Your_Notifications_080d = Tus notificaciones
 Zap_16b4 = Zap
 # Hover text for zap button
 Zap_this_note_42b2 = Enviar un zap a esta nota
-# Label for zoom level, Appearance settings section
-Zoom_Level_29a8 = Nivel de zoom:
 
 # Pluralized strings
 

assets/translations/es-ES/main.ftl

@@ -45,8 +45,6 @@ Algo_2452 = Algo
 Algorithmic_feeds_to_aid_in_note_discovery_d344 = Feeds algorítmicos para ayudar en el descubrimiento de notas
 # Label for zap amount input field
 Amount_70f0 = Cantidad
-# Label for appearance settings section
-Appearance_4c7f = Aspecto
 # Button to send message to Dave AI assistant
 Ask_b7f4 = Preguntar
 # Placeholder text for Dave AI input field
@@ -55,26 +53,16 @@ Ask_dave_anything_33d1 = Pregúntale cualquier cosa a Dave...
 Banner_52ef = Banner
 # Beta version label
 BETA_8e5d = BETA
-# Option in settings section to show the source client label at the bottom of the note
-Bottom_33c8 = Parte inferior
 # Broadcast the note to all connected relays
 Broadcast_fe43 = Transmitir
 # Broadcast the note only to local network relays
 Broadcast_Local_7e50 = Transmitir localmente
 # Button label to cancel an action
 Cancel_ed3b = Cancelar
-# Label for cancel clear cache, Storage settings section
-Cancel_fd8b = Cancelar
-# Label for clear cache button, Storage settings section
-Clear_cache_dccb = Limpiar caché
 # Hover text for editable zap amount
 Click_to_edit_0414 = Haz clic para editar
 # Column title for note composition
 Compose_Note_c094 = Redactar nota
-# Label for configure relays, settings section
-Configure_relays_d156 = Configurar relés
-# Label for confirm clear cache, Storage settings section
-Confirm_9d9d = Confirmar
 # Button label to confirm an action
 Confirm_f8a6 = Confirmar
 # Status label for connected relay
@@ -123,8 +111,6 @@ Custom_a69e = Personalizado
 Customize_Zap_Amount_cfc4 = Personalizar cantidad de zap
 # Column title for support page
 Damus_Support_27c0 = Ayuda de Damus
-# Label for Theme Dark, Appearance settings section
-Dark_85fe = Oscuro
 # Label for deck name input field
 Deck_name_cd32 = Nombre del deck
 # Label for decks section in side panel
@@ -165,14 +151,10 @@ Enter_your_public_key__npub___nostr_address__e_g___address____or_private_key__ns
 Find_User_bd12 = Buscar usuario
 # Title for hashtags column
 Hashtags_f8e0 = Hashtags
-# Option in settings section to hide the source client label in note display
-Hide_281d = Ocultar
 # Title for Home column
 Home_8c19 = Inicio
 # Label for deck icon selection
 Icon_b0ab = Icono
-# Label for Image cache size, Storage settings section
-Image_cache_size_3004 = Tamaño de caché de imágenes:
 # Title for individual user column
 Individual_b776 = Individual
 # Error message for invalid zap amount
@@ -193,12 +175,8 @@ k_50K_c2dc = 50.000
 k_5K_f7e6 = 5.000
 # Description for your notes column
 Keep_track_of_your_notes___replies_a334 = Haz seguimiento de tus notas y respuestas
-# Label for language, Appearance settings section
-Language_e264 = Idioma:
 # Title for last note per user column
 Last_Note_per_User_17ad = Última nota por usuario
-# Label for Theme Light, Appearance settings section
-Light_7475 = Claro
 # Bitcoin Lightning network address field label
 Lightning_network_address__lud16_ea51 = Dirección de la red Lightning (lud16)
 # Login page title
@@ -241,8 +219,6 @@ now_2181 = ahora
 Open_Email_25e9 = Abrir correo electrónico
 # Instruction to open email client
 Open_your_default_email_client_to_get_help_from_the_Damus_team_68dc = Abre tu cliente de correo predeterminado para recibir ayuda del equipo de Damus
-# Label for others settings section
-Others_7267 = Otros
 # Placeholder text for NWC URI input
 Paste_your_NWC_URI_here_b471 = Pega tu NWC URI aquí...
 # Error message for missing deck name
@@ -289,8 +265,6 @@ replying_to_a_note_e0bc = respondiendo a una nota
 Repost_this_note_8e56 = Volver a publicar esta nota
 # Label for reposted notes
 Reposted_61c8 = Publicadas de nuevo
-# Label for reset zoom level, Appearance settings section
-Reset_62d4 = Restablecer
 # Heading for support section
 Running_into_a_bug_1796 = ¿Has encontrado un error?
 # Label for satoshis (Bitcoin unit) for custom zap amount input field
@@ -313,10 +287,6 @@ See_notes_from_your_contacts_ac16 = Ver notas de tus contactos
 See_the_whole_nostr_universe_7694 = Ver todo el universo de nostr
 # Button label to send a zap
 Send_1ea4 = Enviar
-# Column title for app settings
-Settings_7a4f = Configuración
-# Label for Show source client, others settings section
-Show_source_client_9e31 = Mostrar cliente de origen
 # Description for last note per user column
 Show_the_last_note_for_each_user_from_a_list_50e7 = Mostrar la última nota para cada usuario de una lista
 # Button label to sign out of account
@@ -343,8 +313,6 @@ Stay_up_to_date_with_your_notifications_and_mentions_e73e = Mantente al día con
 Step_1_8656 = Paso 1
 # Step 2 label in support instructions
 Step_2_d08d = Paso 2
-# Label for storage settings section
-Storage_ed65 = Almacenamiento
 # Column title for subscribing to external user
 Subscribe_to_someone_else_s_notes_d1e9 = Suscribirse a las notas de otra persona
 # Column title for subscribing to individual user
@@ -357,14 +325,10 @@ Switch_to_light_mode_72ce = Cambiar a modo claro
 Tap_to_Load_4b05 = Toca para cargar
 # Message shown when Dave trial period has ended
 The_Dave_Nostr_AI_assistant_trial_has_ended_____Thanks_for_testing__Zap-enabled_Dave_coming_soon_c6c7 = La prueba del asistente de IA Dave de Nostr ha finalizado :(. ¡Gracias por probarlo! ¡Dave con zaps estará disponible muy pronto!
-# Label for theme, Appearance settings section
-Theme_4aac = Tema:
 # Column title for note thread view
 Thread_0f20 = Conversación
 # Link text for thread references
 thread_ad1f = conversación
-# Option in settings section to show the source client label at the top of the note
-Top_6aeb = Parte superior
 # Title for universe column
 Universe_e01e = Universo
 # Column title for universe feed
@@ -375,8 +339,6 @@ Use_this_wallet_for_the_current_account_only_61dc = Usar este monedero solo para
 username___at___domain___will_be_used_for_identification_a4fd = Se utilizará "{ $username }" en "{ $domain }" para la identificación
 # Profile username field label
 Username_daa7 = Nombre de usuario
-# Label for view folder button, Storage settings section
-View_folder_9742 = Ver carpeta
 # Column title for wallet management
 Wallet_5e50 = Monedero
 # Hint for deck name input field
@@ -395,8 +357,6 @@ Your_Notifications_080d = Tus notificaciones
 Zap_16b4 = Zap
 # Hover text for zap button
 Zap_this_note_42b2 = Enviar un zap a esta nota
-# Label for zoom level, Appearance settings section
-Zoom_Level_29a8 = Nivel de zoom:
 
 # Pluralized strings
 

assets/translations/fr/main.ftl

@@ -376,7 +376,7 @@ username___at___domain___will_be_used_for_identification_a4fd = "{ $username }"
 # Profile username field label
 Username_daa7 = Nom d'utilisateur
 # Label for view folder button, Storage settings section
-View_folder_9742 = Voir le dossier
+View_folder_9742 = Voir le dossier :
 # Column title for wallet management
 Wallet_5e50 = Portefeuille
 # Hint for deck name input field

assets/translations/pt-BR/main.ftl

@@ -376,7 +376,7 @@ username___at___domain___will_be_used_for_identification_a4fd = d = "{ $username
 # Profile username field label
 Username_daa7 = Usuário
 # Label for view folder button, Storage settings section
-View_folder_9742 = Visualizar pasta
+View_folder_9742 = Visualizar pasta:
 # Column title for wallet management
 Wallet_5e50 = Carteira
 # Hint for deck name input field

assets/translations/th/main.ftl

@@ -378,7 +378,7 @@ username___at___domain___will_be_used_for_identification_a4fd = "{ $username }"
 # Profile username field label
 Username_daa7 = ชื่อผู้ใช้
 # Label for view folder button, Storage settings section
-View_folder_9742 = ดูโฟลเดอร์
+View_folder_9742 = ดูโฟลเดอร์:
 # Column title for wallet management
 Wallet_5e50 = วอลเล็ต
 # Hint for deck name input field

assets/translations/zh-CN/main.ftl

@@ -376,7 +376,7 @@ username___at___domain___will_be_used_for_identification_a4fd = "{ $username }"
 # Profile username field label
 Username_daa7 = 用户名
 # Label for view folder button, Storage settings section
-View_folder_9742 = 查看文件夹
+View_folder_9742 = 查看文件夹：
 # Column title for wallet management
 Wallet_5e50 = 钱包
 # Hint for deck name input field

assets/translations/zh-TW/main.ftl

@@ -376,7 +376,7 @@ username___at___domain___will_be_used_for_identification_a4fd = "{ $username }"
 # Profile username field label
 Username_daa7 = 用戶名
 # Label for view folder button, Storage settings section
-View_folder_9742 = 查看文件夾
+View_folder_9742 = 查看文件夾：
 # Column title for wallet management
 Wallet_5e50 = 錢包
 # Hint for deck name input field

crates/notedeck/Cargo.toml

@@ -45,6 +45,7 @@ fluent = { workspace = true }
 fluent-resmgr = { workspace = true }
 fluent-langneg = { workspace = true }
 unic-langid = { workspace = true }
+sys-locale = { workspace = true }
 once_cell = { workspace = true }
 md5 = { workspace = true }
 bitflags = { workspace = true }

crates/notedeck/src/i18n/manager.rs

@@ -3,6 +3,7 @@ use fluent::{FluentArgs, FluentBundle, FluentResource};
 use fluent_langneg::negotiate_languages;
 use std::borrow::Cow;
 use std::collections::HashMap;
+use sys_locale;
 use unic_langid::{langid, LanguageIdentifier};
 
 const EN_US: LanguageIdentifier = langid!("en-US");
@@ -101,10 +102,6 @@ pub struct Localization {
 
 impl Default for Localization {
     fn default() -> Self {
-        // Default to English (US)
-        let default_locale = &EN_US;
-        let fallback_locale = default_locale.to_owned();
-
         // Build available locales list
         let available_locales = vec![
             EN_US.clone(),
@@ -132,8 +129,20 @@ impl Default for Localization {
             (ZH_TW, ZH_TW_NATIVE_NAME.to_owned()),
         ]);
 
+        // Detect system locale and find best match
+        let current_locale = Self::negotiate_system_locale_with_preferences(&available_locales);
+
+        // Fallback locale is always EN_US
+        let fallback_locale = EN_US.clone();
+
+        tracing::info!(
+            "Localization initialized - Selected locale: {}, Fallback: {}",
+            current_locale,
+            fallback_locale
+        );
+
         Self {
-            current_locale: default_locale.to_owned(),
+            current_locale,
             available_locales,
             fallback_locale,
             locale_native_names,
@@ -159,6 +168,150 @@ impl Localization {
         }
     }
 
+    /// Extract just the language and region from locale string (e.g., "fr-FR-u-mu-celsius" -> "fr-FR")
+    fn extract_language_region(locale_str: &str) -> String {
+        // Split by '-' and analyze the parts
+        let parts: Vec<&str> = locale_str.split('-').collect();
+
+        if parts.len() >= 2 {
+            // Check if the second part looks like a region
+            let second_part = parts[1];
+            if (second_part.len() >= 2) {
+                format!("{}-{}", parts[0], parts[1])
+            } else {
+                // Second part is not a region, probably an extension (e.g., "u", "t", "x")
+                // Just return the language part
+                parts[0].to_string()
+            }
+        } else {
+            // Only one part, return as is
+            locale_str.to_string()
+        }
+    }
+
+    /// Negotiate the best locale from all system preferences against available locales
+    fn negotiate_system_locale_with_preferences(
+        available_locales: &[LanguageIdentifier],
+    ) -> LanguageIdentifier {
+        // Get all system preferred locales in descending order
+        let mut system_locales: Vec<String> = sys_locale::get_locales().collect();
+        if system_locales.is_empty() {
+            tracing::info!("No system locales detected, using fallback: en-US");
+            return EN_US.clone();
+        }
+
+        tracing::info!("System preferred locales: {:?}", system_locales);
+
+        // If we only got one locale, it might be that the system only returns the primary locale
+        // In this case, we can try to add common fallbacks based on the detected locale
+        if system_locales.len() == 1 {
+            let primary = &system_locales[0];
+
+            // Try to parse the primary locale, handling extensions
+            let primary_lang = if let Ok(locale) = primary.parse::<LanguageIdentifier>() {
+                locale.language.as_str().to_string()
+            } else {
+                // If parsing fails, try extracting language-region
+                // let stripped = Self::extract_language_region(primary);
+                // if let Ok(locale) = stripped.parse::<LanguageIdentifier>() {
+                //     locale.language.as_str().to_string()
+                // } else {
+                    tracing::info!("Could not parse primary locale: {}", primary);
+                    "unknown".to_string()
+                // }
+            };
+
+            tracing::info!(
+                "Only one system locale detected: {} (language: {})",
+                primary,
+                primary_lang
+            );
+
+            // Add common fallbacks for the detected language
+            match primary_lang.as_str() {
+                "uk" => {
+                    // For Ukrainian, add common fallbacks
+                    system_locales.push("es-ES".to_string());
+                    system_locales.push("en-US".to_string());
+                    tracing::info!("Added fallbacks for Ukrainian: {:?}", system_locales);
+                }
+                "es" => {
+                    // For Spanish, add English fallback
+                    system_locales.push("en-US".to_string());
+                    tracing::info!("Added fallback for Spanish: {:?}", system_locales);
+                }
+                _ => {
+                    // For other languages, add English fallback
+                    system_locales.push("en-US".to_string());
+                    tracing::info!("Added fallback for {}: {:?}", primary_lang, system_locales);
+                }
+            }
+        }
+
+        // Convert system locale strings to LanguageIdentifiers, handling extensions
+        let mut parsed_system_locales = Vec::new();
+        for locale_str in system_locales {
+            // Try to parse the locale string directly first
+            if let Ok(locale) = locale_str.parse::<LanguageIdentifier>() {
+                parsed_system_locales.push(locale);
+                continue;
+            }
+
+            // If parsing fails, try extracting just language-region
+            // let stripped_locale = Self::extract_language_region(&locale_str);
+            // if let Ok(locale) = stripped_locale.parse::<LanguageIdentifier>() {
+            //     parsed_system_locales.push(locale);
+            //     continue;
+            // }
+
+            tracing::info!("Failed to parse locale string: {}", locale_str);
+        }
+
+        if parsed_system_locales.is_empty() {
+            tracing::info!("No valid system locales parsed, using fallback: en-US");
+            return EN_US.clone();
+        }
+
+        // First try exact matches with fluent_langneg
+        let fallback = &EN_US;
+        let negotiated = negotiate_languages(
+            &parsed_system_locales,
+            available_locales,
+            Some(fallback),
+            fluent_langneg::NegotiationStrategy::Filtering,
+        );
+
+        if let Some(result) = negotiated.first() {
+            tracing::info!(
+                "Exact match found: {} from preferences: {:?}",
+                result,
+                parsed_system_locales
+            );
+            return (*result).clone();
+        }
+
+        // If no exact match, try language-only fallbacks
+        tracing::info!("No exact matches found, trying language-only fallbacks");
+        for system_locale in &parsed_system_locales {
+            let system_lang = system_locale.language.as_str();
+
+            // Look for any available locale with the same language
+            for available_locale in available_locales {
+                if available_locale.language.as_str() == system_lang {
+                    tracing::debug!(
+                        "Language match found: {} (system: {})",
+                        available_locale,
+                        system_locale
+                    );
+                    return available_locale.clone();
+                }
+            }
+        }
+
+        tracing::info!("No language matches found, using fallback: en-US");
+        EN_US.clone()
+    }
+
     /// Gets a localized string by its ID
     pub fn get_string(&mut self, id: IntlKey<'_>) -> Result<String, IntlError> {
         self.get_cached_string(id, None)
@@ -458,20 +611,6 @@ impl Localization {
 
         Ok(())
     }
-
-    /// Negotiates the best locale from a list of preferred locales
-    pub fn negotiate_locale(&self, preferred: &[LanguageIdentifier]) -> LanguageIdentifier {
-        let available = self.available_locales.clone();
-        let negotiated = negotiate_languages(
-            preferred,
-            &available,
-            Some(&self.fallback_locale),
-            fluent_langneg::NegotiationStrategy::Filtering,
-        );
-        negotiated
-            .first()
-            .map_or(self.fallback_locale.clone(), |v| (*v).clone())
-    }
 }
 
 /// Statistics about cache usage
@@ -484,6 +623,80 @@ pub struct CacheStats {
 
 #[cfg(test)]
 mod tests {
+    use super::*;
+
+    #[test]
+    fn test_extract_language_region() {
+        // Test that we extract just language and region from various locale formats
+
+        // Test locales with extensions
+        let unicode_locale = "fr-FR-u-mu-celsius";
+        let extracted = Localization::extract_language_region(unicode_locale);
+        assert_eq!(extracted, "fr-FR");
+
+        let transformed_locale = "en-US-t-0-abc123";
+        let extracted = Localization::extract_language_region(transformed_locale);
+        assert_eq!(extracted, "en-US");
+
+        let private_locale = "de-DE-x-phonebk";
+        let extracted = Localization::extract_language_region(private_locale);
+        assert_eq!(extracted, "de-DE");
+
+        // Test simple locale (no extensions)
+        let simple_locale = "en-US";
+        let extracted = Localization::extract_language_region(simple_locale);
+        assert_eq!(extracted, "en-US");
+
+        // Test language-only locale
+        let lang_only = "en";
+        let extracted = Localization::extract_language_region(lang_only);
+        assert_eq!(extracted, "en");
+
+        // Test language with extensions (no region)
+        let lang_with_extensions = "fr-u-mu-celsius";
+        let extracted = Localization::extract_language_region(lang_with_extensions);
+        assert_eq!(extracted, "fr");
+
+        // Test language with other extension types (no region)
+        let lang_with_t_ext = "en-t-0-abc123";
+        let extracted = Localization::extract_language_region(lang_with_t_ext);
+        assert_eq!(extracted, "en");
+
+        let lang_with_x_ext = "de-x-phonebk";
+        let extracted = Localization::extract_language_region(lang_with_x_ext);
+        assert_eq!(extracted, "de");
+
+        // Test locale with numeric region code
+        let numeric_region = "es-419-u-mu-celsius";
+        let extracted = Localization::extract_language_region(numeric_region);
+        assert_eq!(extracted, "es-419");
+
+        // Test locale with 3-letter region code
+        let three_letter_region = "en-USA-t-0-abc123";
+        let extracted = Localization::extract_language_region(three_letter_region);
+        assert_eq!(extracted, "en-USA");
+
+        // Test locale with 2-letter region code
+        let two_letter_region = "fr-FR-u-mu-celsius";
+        let extracted = Localization::extract_language_region(two_letter_region);
+        assert_eq!(extracted, "fr-FR");
+
+        // Test complex locale with multiple parts
+        let complex_locale = "zh-CN-u-ca-chinese-x-private";
+        let extracted = Localization::extract_language_region(complex_locale);
+        assert_eq!(extracted, "zh-CN");
+
+        // Verify that extracted locales can be parsed
+        let test_cases = ["fr-FR", "en-US", "de-DE", "en", "zh-CN"];
+        for extracted in test_cases {
+            if let Ok(locale) = extracted.parse::<LanguageIdentifier>() {
+                tracing::info!("Successfully parsed extracted locale: {}", locale);
+            } else {
+                tracing::error!("Failed to parse extracted locale: {}", extracted);
+                panic!("Should parse locale after extraction");
+            }
+        }
+    }
 
     //
     // TODO(jb55): write tests that work, i broke all these during the refacto

crates/notedeck_columns/src/ui/settings.rs

@@ -16,6 +16,9 @@ use crate::{nav::RouterAction, Damus, Route};
 
 const PREVIEW_NOTE_ID: &str = "note1edjc8ggj07hwv77g2405uh6j2jkk5aud22gktxrvc2wnre4vdwgqzlv2gw";
 
+const THEME_LIGHT: &str = "Light";
+const THEME_DARK: &str = "Dark";
+
 const MIN_ZOOM: f32 = 0.5;
 const MAX_ZOOM: f32 = 3.0;
 const ZOOM_STEP: f32 = 0.1;
@@ -386,7 +389,7 @@ impl<'a> SettingsView<'a> {
                         ThemePreference::Light,
                         richtext_small(tr!(
                             self.note_context.i18n,
-                            "Light",
+                            THEME_LIGHT,
                             "Label for Theme Light, Appearance settings section",
                         )),
                     )
@@ -401,7 +404,7 @@ impl<'a> SettingsView<'a> {
                         ThemePreference::Dark,
                         richtext_small(tr!(
                             self.note_context.i18n,
-                            "Dark",
+                            THEME_DARK,
                             "Label for Theme Dark, Appearance settings section",
                         )),
                     )
@@ -529,18 +532,14 @@ impl<'a> SettingsView<'a> {
             ui.horizontal(|ui| {
                 ui.label(richtext_small(tr!(
                     self.note_context.i18n,
-                    "Sort replies newest first:",
+                    "Sort replies newest first",
                     "Label for Sort replies newest first, others settings section",
                 )));
 
                 if ui
                     .toggle_value(
                         &mut self.settings.show_replies_newest_first,
-                        RichText::new(tr!(
+                        RichText::new(tr!(self.note_context.i18n, "ON", "ON"))
-                            self.note_context.i18n,
-                            "On",
-                            "Setting to turn on sorting replies so that the newest are shown first"
-                        ))
                             .text_style(NotedeckTextStyle::Small.text_style()),
                     )
                     .changed()
@@ -554,7 +553,7 @@ impl<'a> SettingsView<'a> {
             ui.horizontal_wrapped(|ui| {
                 ui.label(richtext_small(tr!(
                     self.note_context.i18n,
-                    "Source client:",
+                    "Source client",
                     "Label for Source client, others settings section",
                 )));