- Added 'has', 'acquire', and 'without' to COMMON_ENGLISH_WORDS dictionary
- Modified is_english detection threshold from 0.05 to 0.04 matches ratio
- Added debug logging to show matches count during English detection
Move COMMON_ENGLISH_WORDS set from youtube_transcript_downloader.py to language_codes.py as a shared constant. This improves code organization and reusability, allowing other modules to reference the same word list for English language detection