Feat/multilingual support mr ta te

[Nareshkumawat-star]

Pull Request: Multilingual Support Expansion (Marathi, Tamil, Telugu)

Description

This PR expands multilingual support across the platform by adding locale support for Marathi (mr), Tamil (ta), and Telugu (te), persisting user language preferences to backend profiles, and adjusting AI system prompts accordingly.

Issue Resolved

Closes #1629

Type of Change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Key Features Added

1. Locale Translations: Complete locale files for Marathi (mr), Tamil (ta), and Telugu (te) covering case filing forms, litigant dashboard, Vakil Friend UI, and notifications.
2. Flag Language Selectors: Updated Navbar and Dashboard language selectors with flag indicators (🇬🇧 English, 🇮🇳 हिंदी, 🚩 मराठी, 🏛️ தமிழ், 📜 తెలుగు).
3. Backend Persistence: Added preferredLanguage column to User entity and PUT /api/v1/auth/language-preference endpoint.
4. Vakil Friend AI Language Prompting: Dynamically injects regional language instructions for Groq LLM responses.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

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Hi @Nareshkumawat-star, thanks for contributing to Nyay Setu! 🎉

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