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.

frontend/src/i18n/locales/es/socialnetwork.json

@@ -681,6 +681,9 @@
                 "languageAssistantInputPlaceholder": "Haz una pregunta sobre la lección o escribe tu propia frase para corregirla.",
                 "languageAssistantSend": "Enviar al asistente",
                 "languageAssistantSending": "Obteniendo respuesta ...",
+                "languageAssistantWaitingTitle": "El asistente sigue trabajando.",
+                "languageAssistantWaitingBody": "Los modelos locales como Ollama pueden tardar unos segundos, especialmente mientras se carga el modelo.",
+                "languageAssistantWaitingElapsed": "Tiempo de espera: {seconds} s",
                 "languageAssistantError": "El asistente no pudo responder ahora mismo.",
                 "languageAssistantPresetExplainStart": "Explícame por favor los patrones y la gramática principales de la lección",
                 "languageAssistantPatternHint": "Concéntrate especialmente en este patrón",