feat: add Turkish localization support

[enscskn]

Summary

Adds Turkish localization support to the Langflow frontend.

Changes

• Added tr.json locale bundle using the same flat dot-key format as the existing locale files
• Registered tr in i18n supported languages
• Added Turkish to the language selector
• Added tests for Turkish bundle loading, locale key parity, and interpolation placeholder parity

Verification

• npm test -- i18n.test.ts --runInBand
• npx @biomejs/biome check src/i18n.ts src/constants/languages.ts src/__tests__/i18n.test.ts src/locales/tr.json
• Verified tr.json has the same 2062 keys and matching interpolation placeholders as en.json
• Verified tr.json has zero non-whitespace control/format characters

[coderabbitai]

Walkthrough

Turkish ("tr") is added as a supported language by inserting an entry in the SUPPORTED_LANGUAGES constant, adding "tr" to the i18n normalizer's accepted codes, and adding a Jest test that verifies loadLanguage("tr") registers the bundle and resolves settings.languageTitle to "Dil".

Changes

Turkish Language Support

Layer / File(s)	Summary
Turkish language constant, i18n normalizer, and test src/frontend/src/constants/languages.ts, src/frontend/src/i18n.ts, src/frontend/src/__tests__/i18n.test.ts	Adds { code: "tr", label: "Türkçe" } to SUPPORTED_LANGUAGES, adds "tr" to the i18n normalizer's accepted set, and adds a test asserting the bundle registers and settings.languageTitle resolves to "Dil".

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 8 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Test Quality And Coverage	⚠️ Warning	The test is a minimal smoke test covering only 0.05% of the Turkish locale (1 of 2062 keys). It validates bundle registration and a single translation key but fails to test the PR's stated constrai...	Add tests validating: (1) Turkish locale has all 2062 keys matching English, (2) sample keys with interpolation placeholders (e.g., errors.fileTooLarge), (3) missing key fallback behavior. The test validates functionality but not the cor...

✅ Passed checks (8 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Test Coverage For New Implementations	✅ Passed	PR includes appropriate test coverage for Turkish language feature: new test case in i18n.test.ts verifies locale loading, bundle registration, and translation retrieval with proper naming conventi...
Test File Naming And Structure	✅ Passed	Test file follows correct frontend testing patterns: *.test.ts naming, Jest structure with describe/it blocks, descriptive test names, proper setup/teardown via beforeEach, and coverage of both pos...
Excessive Mock Usage Warning	✅ Passed	New Turkish test avoids mocks entirely, testing real i18n behavior. Existing tests use spies appropriately for external dependencies. No excessive mocking detected.
Title check	✅ Passed	The title 'feat: add Turkish localization support' clearly and accurately summarizes the main change of adding Turkish language support across the codebase.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

Adds Turkish (tr) localization support to the Langflow frontend by introducing a new Turkish locale bundle and wiring it into the existing lazy-loaded language selection/i18n flow.

Changes:

• Added a Turkish translation resource file (tr.json).
• Registered "tr" as a supported language in the i18n loader and UI language selector list.
• Extended i18n unit tests to validate that the Turkish bundle can be loaded.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/frontend/src/locales/tr.json	Adds Turkish translation strings as a new locale bundle.
src/frontend/src/i18n.ts	Adds "tr" to the supported language list used by normalization and lazy-loading.
src/frontend/src/constants/languages.ts	Adds Turkish to the language selector options (Türkçe).
src/frontend/src/__tests__/i18n.test.ts	Adds a test to ensure the Turkish bundle is registered when loaded.

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