Fix reposts banner to be localizable

Changelog-Fixed: Fixed reposts banner to be localizable
Signed-off-by: Terry Yiu <git@tyiu.xyz>

damusTests/RepostedTests.swift

@@ -0,0 +1,37 @@
+//
+//  RepostedTests.swift
+//  damusTests
+//
+//  Created by Terry Yiu on 2/23/25.
+//
+
+import XCTest
+@testable import damus
+
+final class RepostedTests: XCTestCase {
+
+    func testPeopleRepostedText() throws {
+        let enUsLocale = Locale(identifier: "en-US")
+        let damusState = test_damus_state
+        let pubkey = test_pubkey
+
+        // reposts must be greater than 0. Empty string is returned as a fallback if not.
+        XCTAssertEqual(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: -1, locale: enUsLocale), "")
+        XCTAssertEqual(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: 0, locale: enUsLocale), "")
+
+        // Verify the English pluralization variations.
+        XCTAssertEqual(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: 1, locale: enUsLocale), "17ldvg64:nq5mhr77 reposted")
+        XCTAssertEqual(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: 2, locale: enUsLocale), "17ldvg64:nq5mhr77 and 1 other reposted")
+        XCTAssertEqual(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: 3, locale: enUsLocale), "17ldvg64:nq5mhr77 and 2 others reposted")
+
+        // Sanity check that the non-English translations are likely not malformed.
+        Bundle.main.localizations.map { Locale(identifier: $0) }.forEach {
+            // -1...11 covers a lot (but not all) pluralization rules for different languages.
+            // However, it is good enough for a sanity check.
+            for reposts in -1...11 {
+                XCTAssertNoThrow(people_reposted_text(profiles: damusState.profiles, pubkey: pubkey, reposts: reposts, locale: $0))
+            }
+        }
+    }
+
+}