frontend: localize hardcoded "Lines" and "All" strings in LogsButton

[Adii-45]

Summary

Localizes two hardcoded English strings ("Lines" and "All") in the LogsButton
lines-count dropdown that were missed when other LogsButton strings were localized.

Related Issue

Fixes #6128

Changes

• Replaced hardcoded Lines label with the existing translation key.
• Replaced hardcoded All menu item with the existing translation key.
• Reused existing translation entries; no new translation keys were added.

Testing

• npm run frontend:lint:fix
• npm run frontend:lint
• npm run frontend:tsc
• Relevant component tests pass

Notes for the Reviewer

Both translation keys ("All" and "Lines") already exist infrontend/src/i18n/locales/en/translation.json (lines 405 and 665 respectively) so no translation file changes are required. The "All" key is already used by this same component for the Severity dropdown's renderValue.

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[Adii-45]

Hi @illume,

This is my first contribution to Headlamp. The change is intentionally small and scoped to issue #6128, reusing the existing i18n keys already present in the project!

I'd appreciate any feedback or suggestions for improvement. Looking forward to contributing more to Headlamp..!

Thanks!

[Copilot]

Pull request overview

This PR improves frontend internationalization coverage in the LogsButton UI by replacing two remaining hardcoded English strings in the “lines count” dropdown with existing i18n translation keys.

Changes:

• Localized the “Lines” InputLabel in the logs line-count selector.
• Localized the “All” menu option in the same selector using an existing translation key.

[skoeva]

could you rebase this against main?