refactor: enhance localization support in chat and voice input features

- Integrated localization for various dialog messages and UI elements in the chat and voice input components.
- Updated the confirmation dialog to utilize localized strings for delete messages, improving user experience across different languages.
- Enhanced voice input sheet to reflect localized text for status updates, action buttons, and prompts, ensuring consistency in user interactions.
- Improved the file attachment widget to display the attachment label in a localized manner, enhancing accessibility for users in different regions.
- Streamlined localization management by centralizing string retrieval, promoting maintainability and clarity in the codebase.

lib/l10n/app_de.arb

@@ -127,12 +127,24 @@
   "onboardQuickBullet2": "Neuer Chat starten oder Modelle oben verwalten"
   ,
   "addAttachment": "Anhang hinzufügen",
+  "attachmentLabel": "Anhang",
   "tools": "Werkzeuge",
   "voiceInput": "Spracheingabe",
+  "voice": "Sprache",
+  "voiceStatusListening": "Hört zu…",
+  "voiceStatusRecording": "Nimmt auf…",
+  "voiceHoldToTalk": "Zum Sprechen halten",
+  "voiceAutoSend": "Automatisch senden",
+  "voiceTranscript": "Transkript",
+  "voicePromptSpeakNow": "Jetzt sprechen…",
+  "voicePromptTapStart": "Tippe auf \"Starten\", um zu beginnen",
+  "voiceActionStop": "Stopp",
+  "voiceActionStart": "Starten",
   "messageInputLabel": "Nachrichteneingabe",
   "messageInputHint": "Nachricht eingeben",
   "messageHintText": "Nachricht...",
   "stopGenerating": "Generierung stoppen",
+  "codeCopiedToClipboard": "Code in die Zwischenablage kopiert.",
   "send": "Senden",
   "sendMessage": "Nachricht senden",
   "file": "Datei",
@@ -289,6 +301,9 @@
   "appCustomization": "App-Anpassung",
   "appCustomizationSubtitle": "Personalisieren, wie Namen und UI angezeigt werden",
   "quickActionsDescription": "Wähle bis zu zwei Schnellzugriffe, die neben dem Eingabefeld angepinnt werden",
+  "chatSettings": "Chat",
+  "sendOnEnter": "Mit Enter senden",
+  "sendOnEnterDescription": "Enter sendet (Soft-Tastatur). Cmd/Ctrl+Enter ebenfalls verfügbar",
   "display": "Anzeige",
   "realtime": "Echtzeit",
   "transportMode": "Transportmodus",