Update and improve translations for multiple language files (ar, de, es, fr, hi, id, it, ja, pl, pt, ru, tr, zh). Key changes include localized strings for playlist saving ("Save Playlist As" -> localized), save/result/error messages, concurrent connections and help text, default selection/settings (video quality and subtitle language), and various wording/typo fixes. Also add/translate FFmpeg installation and yt-dlp setup messages in Turkish and Chinese. No functional code changes.
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