feat(VocabService, localization, VocabLessonView): extend assistant wait feedback and timeout duration

- Increased the timeout duration for the language assistant from 30 seconds to 120 seconds to accommodate longer processing times.
- Added new localization strings across multiple languages (Cebuano, German, English, Spanish, French) to provide user feedback during the assistant's wait period, enhancing clarity and user experience.
- Implemented a visual waiting indicator in VocabLessonView to inform users that the assistant is still processing their request, improving overall interaction quality.

backend/services/vocabService.js

@@ -2844,7 +2844,7 @@ export default class VocabService {
     }
 
     const controller = new AbortController();
-    const timeout = setTimeout(() => controller.abort(), 30000);
+    const timeout = setTimeout(() => controller.abort(), 120000);
 
     const temperatureByMode = {
       explain: 0.4,
@@ -2878,7 +2878,7 @@ export default class VocabService {
     } catch (error) {
       const err = new Error(
         error?.name === 'AbortError'
-          ? 'Der Sprachassistent hat zu lange für eine Antwort gebraucht.'
+          ? 'Der Sprachassistent hat länger als zwei Minuten für eine Antwort gebraucht.'
           : 'Der Sprachassistent konnte nicht erreicht werden.'
       );
       err.status = 502;