Add support for private and hashtag channels in localization and channel management

- Updated Polish, Portuguese, Slovak, Slovenian, Swedish, and Chinese localization files to include new strings for creating and joining private channels, as well as joining hashtag channels.
- Enhanced the channel management UI to allow users to create and join private channels, join public channels, and join channels via hashtags.
- Implemented PSK derivation from hashtags using SHA256 in the Channel model.
- Improved the translation script to handle missing keys and translate all locales efficiently.

lib/l10n/app_localizations_pt.dart

@@ -829,6 +829,46 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get channels_sortUnread => 'Não lido';
 
+  @override
+  String get channels_createPrivateChannel => 'Criar um Canal Privado';
+
+  @override
+  String get channels_createPrivateChannelDesc =>
+      'Protegido com uma chave secreta.';
+
+  @override
+  String get channels_joinPrivateChannel => 'Junte-se a um Canal Privado';
+
+  @override
+  String get channels_joinPrivateChannelDesc =>
+      'Inserir uma chave secreta manualmente.';
+
+  @override
+  String get channels_joinPublicChannel => 'Junte-se ao Canal Público';
+
+  @override
+  String get channels_joinPublicChannelDesc =>
+      'Qualquer pessoa pode entrar neste canal.';
+
+  @override
+  String get channels_joinHashtagChannel => 'Junte-se a um Canal com Hashtag';
+
+  @override
+  String get channels_joinHashtagChannelDesc =>
+      'Qualquer pessoa pode participar de canais com hashtag.';
+
+  @override
+  String get channels_scanQrCode => 'Digitalizar um Código QR';
+
+  @override
+  String get channels_scanQrCodeComingSoon => 'Em breve';
+
+  @override
+  String get channels_enterHashtag => 'Insira hashtag';
+
+  @override
+  String get channels_hashtagHint => 'ex. #equipe';
+
   @override
   String get chat_noMessages => 'Ainda não existem mensagens.';