fix(i18n): OpenDyslexic font supports Cyrillic (#513)

* fix(i18n): OpenDyslexic font supports Cyrillic

The OpenDyslexic subtitle in the font picker stated "no RU/ZH support",
but the bundled `@fontsource/opendyslexic` 5.x ships Cyrillic glyphs and
Russian renders correctly — verified empirically. Only Chinese (CJK)
actually falls back to the system font. Updated the subtitle string in
all 8 locales accordingly; the Russian locale itself no longer claims
unsupported-self.

* docs(changelog): correct OpenDyslexic locale-coverage claim (#513)

The #507 entry in the unreleased v1.46.0 block claimed `Latin +
Latin-extended only` and listed Cyrillic among the system-font
fallbacks. Cyrillic glyphs ship in @fontsource/opendyslexic 5.x and
render correctly — only Chinese (CJK) actually falls back. Updated the
bullet in place to match the corrected subtitle hints from this PR.

src/locales/ru.ts

@@ -611,7 +611,7 @@ export const ruTranslation = {
     languageRu: 'Русский',
     languageRu2: 'Русский 2',
     font: 'Шрифт',
-    fontHintOpenDyslexic: 'Подходит для дислексии · без поддержки RU/ZH',
+    fontHintOpenDyslexic: 'Подходит для дислексии · без поддержки китайского',
     theme: 'Тема',
     appearance: 'Оформление',
     servers: 'Серверы',