feat(i18n): add Russian localization (#48)

* feat(i18n): add Russian localization

* fix: missing i18n keys

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Co-authored-by: Violetta <[email protected]>
Co-authored-by: Draculabo <[email protected]>

src/routes/settings.tsx

@@ -125,6 +125,7 @@ function SettingsPage() {
                   <SelectContent>
                     <SelectItem value="en">{t('settings.language.english')}</SelectItem>
                     <SelectItem value="zh-CN">{t('settings.language.chinese')}</SelectItem>
+                    <SelectItem value="ru">{t('settings.language.russian')}</SelectItem>
                   </SelectContent>
                 </Select>
               </div>