Summary

• The issue was that users specifying languages=["gr"] for Greek language PDFs were getting incorrect OCR output because "gr" (the ISO 3166-1 alpha-2 country code for Greece) was not mapped to the Tesseract language code "ell".
• Similarly, "el" (the ISO 639-1 language code for Modern Greek) was also not mapped.
• This fix adds both "gr" and "el" as aliases in TESSERACT_LANGUAGES_AND_CODES that map to "ell", which is the correct Tesseract code for Modern Greek.
• This ensures that users who pass either languages=["gr"] or languages=["el"] will get proper Greek OCR processing.

Fixes #2939

This PR was auto-generated by Gittensor bot using Claude AI to fix a reported issue.