Merge two table cells into a single row in multiple translated README files to correct the features table layout (combine "Generic mode" and "Localization in 14 languages"). Affected files: readme-translations/README.{ar,de,es,fr,hi,id,it,ja,pl,pt,ru,tr,zh}. Improves consistency and readability across translations.
Document Audio Normalization (EBU R128) in README and translated READMEs, and add corresponding localization keys and help text in ytsage language files. Updates include README.md, readme-translations (ar,de,es,fr,hi,id,it,ja,pl,pt,ru,tr,zh) and ytsage/languages JSON files to explain the feature and note that normalization requires re-encoding and forcing a specific audio format (e.g. MP3 or M4A).
Add localized README files and update main README to expose them. Creates readme-translations/*.md (Arabic, German, Spanish, French, Hindi, Indonesian, Italian, Japanese, Polish, Portuguese, Russian, Turkish, Chinese) and adds a language list, README Translations table, and a "Contributing Translations" subsection to README.md so contributors can find and update localized docs.
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