Expanded and updated translation files (ja, pt, ru, tr, zh) with new keys for download progress, error messages, playlist info, and subtitle selection. This improves localization coverage and user feedback during download and error scenarios.
The format table now displays FPS (frame rate) instead of notes in both playlist and normal modes. All translations were updated to remove the 'notes' and related size/quality fields, replacing them with 'fps'. The table column widths were adjusted for better visibility, and FPS values are color-coded based on their value. The obsolete _get_format_notes method was removed.
Added a new Japanese translation file (ja.json) and updated all language files to include Japanese in the language selection. Updated quality label color detection in ytsage_gui_format_table.py to support Japanese terms, and registered Japanese in the default language list in ytsage_localization.py.
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