Fix locale.Error: unsupported locale setting in minimal environments

[Copilot]

This PR fixes a crash that occurs when running the translator in minimal environments (like Makefiles, containers, or systems with incomplete locale configurations) where locale.setlocale(locale.LC_ALL, '') fails with locale.Error: unsupported locale setting.

Problem

The issue manifested as:

Traceback (most recent call last):
  File "/home/waser/Projets/DFI/backend/.venv/bin/translate", line 5, in <module>
    from translator.main import main
  File "/home/waser/Projets/DFI/backend/.venv/lib/python3.13/site-packages/translator/main.py", line 21, in <module>
    locale.setlocale(locale.LC_ALL, '')
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/locale.py", line 615, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

This prevented the translator from running in environments where locale settings are not properly configured or supported.

Solution

Wrapped the locale.setlocale(locale.LC_ALL, '') call in a try-except block to gracefully handle locale.Error exceptions. The locale setting is used for convenience/formatting but is not critical to the core translation functionality, as evidenced by the get_sys_lang_format() function already having its own fallback logic.

Changes

• Added error handling around locale setting in translator/main.py
• Maintains backward compatibility - no behavior change in working environments
• Prevents crashes in minimal environments while preserving all functionality
• Added clear comments explaining the error handling rationale

Testing

Verified the fix handles various problematic environments:

• ✅ Normal environments: No change in behavior
• ✅ Empty locale variables: Continues gracefully
• ✅ Invalid locale settings: No longer crashes
• ✅ Maintains all existing functionality

Fixes #17.

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[wasertech]

LGTM