Polish Japanese README translation and formatting: update wording and punctuation for clarity, translate and normalize section headings and links, refine tables and feature lists, adjust installation and platform-specific instructions, update screenshot alt text and usage examples, and improve troubleshooting and localization entries for consistency.
Add a new note about the "Concurrent Connections" download setting to multiple translated README files under readme-translations/. The entry documents that downloading files in multiple simultaneous fragments can drastically increase speed, and notes the default of 1 and a recommended maximum of 8–10 to avoid IP throttling. Files updated include translations for AR/DE/ES/FR/HI/ID/IT/JA/PL/PT/RU/TR/ZH.
Update translated README feature lists to include audio normalization (EBU R128). Applied the change across multiple language files in readme-translations (ar, de, es, fr, hi, id, it, ja, pl, pt, ru, tr, zh) to reflect the new audio normalization feature in the project documentation.
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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