i18n: make localization context non-global

- Simplify Localization{Context,Manager} to just Localization
- Fixed a bunch of lifetime issueo
- Removed all Arcs and Locks
- Removed globals
  * widgets now need access to &mut Localization for i18n

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_ui/src/note/contents.rs

@@ -323,6 +323,7 @@ pub fn render_note_contents(
             &supported_medias,
             carousel_id,
             trusted_media,
+            note_context.i18n,
         );
         ui.add_space(2.0);
     }