fix: accurate sync speed display, add missing i18n keys, native language names
- Fix blk/s calculation that was inflated ~10x due to resetting the time baseline every frame instead of only when blocks advanced - Add decay when no new blocks arrive for 10s so rate doesn't stay stale - Add 7 missing translation keys (timeout_off/1min/5min/15min/30min/1hour, slider_off) to all 8 language files so settings dropdowns translate - Show language names in native script (中文, Русский, 日本語, 한국어)
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