Implement Polish translation (#6283)

* Initial polish translation sweep

* rewrite feeds page flavor text

* bring up to date with dev branch, revisit some strings

* redoing some more...

* bring up to date

* rm dead strings, try out a different phrasing for threaded mode str

prev translation was nonsensical - we're already calling threads "wątki". let's try "recursive tree" instead to describe what threaded mode does

* tweaks here and there

* more tweaks. sign translation file

TL note: trying a new space-saving translation for send via direct message, old one made the context menu stretch

* space-saving translations for profile tabs

* up to date

* tl latest changes

* some small fixes

* few more tweaks around profile editing strings

* i dislike gendered languages

* yet more tweaks

* Update dates.ts

* Review suggestions (1)

* tiny fixes

* Review suggestions (2)

* Review suggestions (3)

* Review suggestions (4)

* "Anuluj wyciszenie"

* A few new strings

* Remove dead strings again

* Review suggestions (5)

* te -> to

---------

Co-authored-by: Frudrax Cheng <i@cynosura.one>

src/locale/i18n.ts

@@ -25,6 +25,7 @@ import {messages as messagesId} from '#/locale/locales/id/messages'
 import {messages as messagesIt} from '#/locale/locales/it/messages'
 import {messages as messagesJa} from '#/locale/locales/ja/messages'
 import {messages as messagesKo} from '#/locale/locales/ko/messages'
+import {messages as messagesPl} from '#/locale/locales/pl/messages'
 import {messages as messagesPt_BR} from '#/locale/locales/pt-BR/messages'
 import {messages as messagesRu} from '#/locale/locales/ru/messages'
 import {messages as messagesTh} from '#/locale/locales/th/messages'
@@ -144,6 +145,14 @@ export async function dynamicActivate(locale: AppLanguage) {
       ])
       break
     }
+    case AppLanguage.pl: {
+      i18n.loadAndActivate({locale, messages: messagesPl})
+      await Promise.all([
+        import('@formatjs/intl-pluralrules/locale-data/pl'),
+        import('@formatjs/intl-numberformat/locale-data/pl'),
+      ])
+      break
+    }
     case AppLanguage.pt_BR: {
       i18n.loadAndActivate({locale, messages: messagesPt_BR})
       await Promise.all([