feat(translation): add multilanguage support

[yasserfedsi]

Description

This PR introduces English/French (EN/FR) internationalization support and related structural improvements.

Key changes:

• feat(i18n): Introduced a language context and updated application headers to support multi-language switching (EN/FR).
• feat: Added unique IDs to job entries to ensure stable identification and better alignment with JobProps.
• fix: Corrected invalid JSON syntax by adding missing commas in startups data.

Why this change?

• Enables bilingual support (EN/FR) to improve accessibility for a broader audience and prepare the application for future language expansion.
• Centralizes language handling using a language context, reducing duplication and making translations easier to maintain.
• Ensures UI elements such as headers respond dynamically to language changes.
• Improves data reliability by enforcing unique job identifiers, which helps prevent rendering issues and simplifies future enhancements.

Type of Change

• Add/Edit data
• Bug fix
• New feature
• Code enhancement
• Documentation update

Checklist

• I have tested my changes locally
• My code follows the project's coding style

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[HouariZegai]

Thank you very much for the effort and time you put into this PR @yasserfedsi

I’d suggest postponing the addition of i18n for now and opening an issue first so we can discuss the need and scope together (as mentioned in the CONTRIBUTING.md).

If we later decide to support multiple languages, prioritizing Arabic might be more appropriate than French in this context.