Add French (fr) localization for Gabon (GA)

[aman-coder03]

Adds missing French (fr) localization for Gabon (GA).

This introduces a new GA.po file with correct gettext structure
(English source strings with French translations), following existing
Francophone locale patterns.

fixes #3176.
Part of #3152.

[coderabbitai]

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Summary by CodeRabbit

• New Features

  • Gabon holidays now support French and English localization, with French as the default.
  • Holiday names and the "estimated" label are localized; new French and en_US translation catalogs added.

• Tests

  • Added tests validating French and English holiday name translations for Gabon.

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Walkthrough

Adds French and en_US localization catalogs for Gabon (GA), updates the Gabon country class to set default and supported languages and wrap public holiday names with translations, and adds a test validating French localization.

Changes

Cohort / File(s)	Summary
French localization PO holidays/locale/fr/LC_MESSAGES/GA.po	New French translation catalog with PO headers and French msgstr translations for Gabon holiday names and phrases (e.g., "%s (estimated)", Independence Day variants).
en_US localization PO holidays/locale/en_US/LC_MESSAGES/GA.po	New English (en_US) PO file with msgstr entries matching msgids and standard PO headers.
Gabon country implementation holidays/countries/gabon.py	Added default_language = "fr" and supported_languages = ("fr", "en_US"); introduced tr alias and wrapped all public holiday name strings and estimated_label with tr(...).
Tests tests/countries/test_gabon.py	Added test_l10n_default to assert French-localized holiday names for 2022.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• Update Bangladesh holidays: add l10n support #3117 — Implements similar localization changes (tr() wrapping, language attrs, PO files, l10n tests) for a different country module.

Suggested reviewers

• arkid15r
• KJhellico
• PPsyrius

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding French localization for Gabon holidays, which is clearly the primary focus of the changeset.
Description check	✅ Passed	The description is relevant and explains the purpose of the PR, detailing that it adds French (fr) localization for Gabon with proper gettext structure and referencing related issues.
Linked Issues check	✅ Passed	The PR implements all requirements from #3176: adds French holiday names and translations in GA.po, ensures consistency with existing Francophone locale patterns, and includes tests for the new localization.
Out of Scope Changes check	✅ Passed	All changes are directly in scope. The PR adds French translations (GA.po files), updates gabon.py with i18n support and language metadata, and includes a localization test—all aligned with issue #3176.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud