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/ceb/socialnetwork.json

@@ -715,6 +715,9 @@
                 "languageAssistantInputPlaceholder": "Ask a leksiyon question o write imong own sentence para sa tamaion.",
                 "languageAssistantSend": "Padal-a ang aron katabang",
                 "languageAssistantSending": "Getting answer ...",
+                "languageAssistantWaitingTitle": "Ang pinulongan katabang is still working.",
+                "languageAssistantWaitingBody": "Local models sama sa Ollama can take a few seconds, especially kung loading pa ang model.",
+                "languageAssistantWaitingElapsed": "Waiting time: {seconds} s",
                 "languageAssistantError": "Ang pinulongan katabang could not answer right now.",
                 "languageAssistantPresetExplainStart": "Palihog explain ang main patterns ug grammar sa ang leksiyon",
                 "languageAssistantPatternHint": "Focus especially sa kini nga pattern",