refactor: use Crowdin API for translation checks

[abdel792]

Description

This PR refactors the checkTranslation.py script to officially utilize the Crowdin API for translation validation. By fetching data directly from the Crowdin API, the script now provides the real-time translation status for all addon components.

Changes

Crowdin API Integration

• Direct API Queries: The script now connects directly to the Crowdin API, making previous dependencies such as langid and polib no longer necessary.
• Smart File Mapping: Improved logic to bridge the gap between local files and Crowdin sources (e.g., mapping a local .po request to the .pot source template on the API).
• Multi-format Support & Priority: For each addon, the script now considers the three possible source files: .md, .po, and .xliff.
• Dynamic Documentation Selection: When checking documentation, the script compares the translation progress between the .md and .xliff files. It automatically selects the one with the highest translation ratio, with a built-in priority for the XLIFF format.
• Case-Insensitive Matching: Enhanced search algorithm to ensure source files are correctly identified regardless of casing differences on Crowdin.

Technical Details

• Dependency Cleanup: Removed reliance on langid and polib as the API provides all necessary metadata and scoring.
• Output Variables: Standardized output for poScore, mdScore, and translationRatio to ensure seamless integration with existing CI/CD and PowerShell workflows.

Checklist

• Verified that translation scores are fetched directly via Crowdin API calls.
• Confirmed the logic for selecting the best translation ratio between .md and .xliff files (priority to XLIFF).
• Confirmed correct mapping between local file extensions and Crowdin source templates.
• Verified that the script correctly identifies files despite any casing variations on Crowdin.
• Confirmed the script returns exit code 0 for scores above 5% and code 1 otherwise.

[nvdaes]

Thanks @abdel792 . I'll merge this, and later I'll made changes like running pre-commit.