fix: update language switch disable condition in HeaderAction component

- Removed the isEssential check from the language switch disable condition, ensuring that the language option is only disabled based on supported locales. This change improves the user experience by allowing users to switch languages more freely when supported.

Author: shhdgit

src/components/Layout/HeaderAction.tsx

@@ -21,7 +21,6 @@ import { Locale, BuildType } from "shared/interface";
 import { ActionButton } from "components/Card/FeedbackSection/components";
 import { Link } from "gatsby";
 import { useIsAutoTranslation } from "shared/useIsAutoTranslation";
-import { useCloudPlan } from "shared/useCloudPlan";
 
 const useTiDBAIStatus = () => {
   const [showTiDBAIButton, setShowTiDBAIButton] = React.useState(true);
@@ -124,7 +123,6 @@ const LangSwitch = (props: {
   supportedLocales: Locale[];
 }) => {
   const { supportedLocales } = props;
-  const { isEssential } = useCloudPlan();
 
   const [anchorEl, setAnchorEl] = React.useState<null | HTMLElement>(null);
 
@@ -225,7 +223,7 @@ const LangSwitch = (props: {
           onClick={toggleLanguage(Locale.ja)}
           disableRipple
           selected={language === Locale.ja}
-          disabled={!supportedLocales.includes(Locale.ja) || isEssential}
+          disabled={!supportedLocales.includes(Locale.ja)}
         >
           <Typography component="span" color={theme.palette.carbon[900]}>
             <Trans i18nKey="lang.ja" />