test : added unit tests for translateText function

[tmdeveloper007]

Closes #2058.

Summary of What Has Been Done:
Added unit tests for translateText and SUPPORTED_LANGUAGES in Frontend/src/services/translationService.js.

Changes Made:

• Created Frontend/src/services/translationService.test.js with 9 test cases
• Tests same-lang fallback, empty/whitespace inputs, successful API response, HTTP errors, non-200 status, and fetch exceptions
• Mocks globalThis.fetch for deterministic testing
• Verifies graceful fallback returns original text on all error paths

Impact it Made:

• Ensures translation service degrades gracefully when MyMemory API is unavailable
• Documents the fallback contract for maintainers
• All 9 tests pass (verified with vitest run)

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📥 Commits

Reviewing files that changed from the base of the PR and between da8faf2 and 2ae5b0c.

📒 Files selected for processing (1)

• Frontend/src/services/translationService.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[riteshbonthalakoti]

Superb implementation, @tmdeveloper007! I've successfully resolved all conflicts in your PR and queued it for merging into gssoc.

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[tmdeveloper007]

Hi @ritesh-1918, this PR was merged but does not have GSSoC labels applied. Could you please add the appropriate labels (e.g. gssoc, gssoc:approved, level:beginner/level:advanced, type:testing/type:bug/type:docs etc.) so the contribution is properly tracked for GSSoC? Thank you!