Add Turkish translation (contributed by Hakan Arslan) (ihasmail #32)

(cherry picked from commit 017b1b5eb812ba18c3577ff79c544a25f7f91aaa)

web/src/lib/languages.ts

@@ -48,6 +48,7 @@ export const UI_LANGUAGES: readonly UiLanguage[] = [
   { tag: "ru", name: "Русский" },
   { tag: "uk", name: "Українська" },
   { tag: "zh-Hans", name: "简体中文" },
+  { tag: "tr", name: "Türkçe" },
 ];
 
 /** Where to report a bad translation. Beta languages depend on it. */