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)

src/embedded/lang_de.h

@@ -2736,56 +2736,73 @@ unsigned char res_lang_de_json[] = {
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@@ -3402,4 +3419,4 @@ unsigned char res_lang_de_json[] = {
   0x73, 0x65, 0x73, 0x22, 0x3a, 0x20, 0x22, 0x5a, 0x2d, 0x41, 0x64, 0x72,
   0x65, 0x73, 0x73, 0x65, 0x6e, 0x22, 0x0a, 0x7d, 0x0a
 };
-unsigned int res_lang_de_json_len = 40821;
+unsigned int res_lang_de_json_len = 41025;