Implementation of translation frontend for P4

[sabualha]

Summary

• Implements translation feature for NodeBB posts
• Adds 'isEnglish' and 'translatedContent' field to posts
• Adds UI toggle to view translated content

Changes

• Backend: Added translation module and integrated with post creation
• OpenAPI Schemas: updated PostObject schema with translation fields
• Frontend: Added translation toggle button UI in post templates
• Client-Side: Javascript to show/hide translated content

[coveralls]

Pull Request Test Coverage Report for Build 19214060715

Details

• 10 of 10 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 78.183%

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Totals
Change from base Build 19212036180:	0.006%
Covered Lines:	24849
Relevant Lines:	29906

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💛 - Coveralls

[aalmuhan]

This PR cleanly introduces translation support across the API and frontend. The new isEnglish and translatedContent fields are added consistently to all OpenAPI surfaces, the topic template integrates the translation toggle smoothly, and the frontend behavior is simple and intuitive. The backend wiring in Posts.create, summary, and modifyPost is aligned and keeps the flow straightforward. Overall, the implementation is clear, cohesive, and fits well into the existing NodeBB structure.