Fix #437: Translate 33 hardcoded tooltips

[marioalbu08]

Summary

Resolves #437 by migrating all hardcoded English tooltips to the i18n translation system.

Changes

• Extracted 6 hardcoded title attributes from components/Topbar.tsx
• Extracted 27 hardcoded title attributes from components/views/ScanResults.tsx
• Added all 33 extracted strings to a new component namespace in messages/en.json
• Replaced the hardcoded strings in the components with t('component.key') and i18n('component.key') respectively

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation update

Testing

• I have tested these changes locally
• I have added/updated tests as needed

Screenshots

N/A (No visual changes, purely internationalization)

[github-actions]

Thanks for the first pull request here. CI needs a maintainer to approve the run before it starts, so it may sit for a bit before anything happens. pytest tests/ -q passing is the main thing I look at.

[NovaCode37]

Thanks for taking all 33. Two things before this can go in.

1. en.json was re-serialized. The 33 new keys are about 35 lines, but the diff is 294 because the whole file went through a JSON writer: … and · became escape sequences and the compact one-line objects were expanded. That makes the file harder for translators to read and the PR hard to review. Please restore en.json from main and add only the new keys, by hand, next to the keys they belong with.

2. The other nine locales need the same keys. CI fails in frontend/scripts/test-i18n-keys.mjs, which requires every file in frontend/src/messages/ to have identical keys. The issue told you English was enough; that was my mistake and the issue text is fixed now. Real translations where you can, the English text where you cannot.

Smaller: the keys are all under a flat component.*. The existing ones are grouped by where they are used, topbar.* and results.*, and #444 adds aria-labels for some of the same Topbar buttons. Reusing its topbar.* keys where the text is identical saves you a few.

cd frontend && npm run test:i18n confirms the locales line up.