fix(web): stop spurious page refresh on account menu open; plugin log auto-refresh as switch

Two unrelated frontend fixes:

- LanguageSelector mounts each time the sidebar account dropdown opens and
  unconditionally called i18n.changeLanguage() on mount, emitting a
  languageChanged event even when the language was unchanged. That handed
  every useTranslation() consumer a fresh `t` reference, re-running effects
  keyed on `t` (e.g. the plugins page system-status fetch) and surfacing as
  a page "refresh". Guard the call so it only fires on an actual change.

- Plugin logs auto-refresh control changed from a toggle Button to a
  Switch + Label; the on/off button i18n keys are replaced by a single
  static logsAutoRefresh label across all 8 locales.

web/src/i18n/locales/ru-RU.ts

@@ -604,8 +604,7 @@ const ruRU = {
     tabLogs: 'Журналы',
     logsLevelAll: 'Все уровни',
     logsRefresh: 'Обновить',
-    logsAutoRefreshOn: 'Автообновление: вкл.',
-    logsAutoRefreshOff: 'Автообновление: выкл.',
+    logsAutoRefresh: 'Автообновление',
     logsEmpty:
       'Журналов пока нет. Здесь появятся логи, выводимые плагином через logger.',
     fileUpload: {