Fix code fences and a typo in Locales & translations documentation (#2842) (#2868)

* docs(backend): correct TypeScript code fences in TS tabs (controllers, services, middlewares, routes)

* docs(bundlers): clarify webpack config example rename and JS/TS filenames

* docs(routes): add guidance to prefer fully-qualified handler names in custom routers

* docs(api-tokens): add concise security tip (least privilege, rotation, secrets manager)

* docs(controllers): add caution about validateQuery/sanitizeQuery/sanitizeOutput when overriding actions

* docs(policies): clarify scoped policy folders and fix example path

* docs(webhooks): add signature verification tip and fix TS config path

* docs(theme-extension): add minimal TS example for theme.light and theme.dark overrides

* docs(wysiwyg): add next steps tip (plugin first, custom field for deeper integration)

* docs(middlewares): add tip to list registered middlewares (discovery command)

* docs(models): add TL;DR with emphasis on content shape and Document Service

* docs(locales-translations): fix typo and use proper js/ts fences instead of jsx

* Limit PR scope based on title; keep only intended doc(s); revert unrelated files

---------

Co-authored-by: GitHub Actions <noreply@github.com>

Author: pwizla

docusaurus/docs/cms/admin-panel-customization/locales-translations.md

@@ -17,7 +17,7 @@ Configure the admin panel languages by updating the `config.locales` array and o
 
 The Strapi [admin panel](/cms/admin-panel-customization) ships with English strings and supports adding other locales so your editorial team can work in their preferred language. Locales determine which languages appear in the interface, while translations provide the text displayed for each key in a locale.
 
-This guide targets project maintainers customizing the admin experience from the application codebase. All examples modify the configuration exported from `/src/admin/app`file, which Strapi loads when the admin panel builds. You'll learn how to declare additional locales and how to extend Strapi or plugin translations when a locale is missing strings.
+This guide targets project maintainers customizing the admin experience from the application codebase. All examples modify the configuration exported from `/src/admin/app` file, which Strapi loads when the admin panel builds. You'll learn how to declare additional locales and how to extend Strapi or plugin translations when a locale is missing strings.
 
 ## Defining locales
 
@@ -26,7 +26,7 @@ To update the list of available locales in the admin panel, set the `config.loca
 <Tabs groupId="js-ts">
 <TabItem value="js" label="JavaScript">
 
-```jsx title="/src/admin/app.js"
+```js title="/src/admin/app.js"
 export default {
   config: {
     locales: ["ru", "zh"],
@@ -39,7 +39,7 @@ export default {
 
 <TabItem value="ts" label="TypeScript">
 
-```jsx title="/src/admin/app.ts"
+```ts title="/src/admin/app.ts"
 export default {
   config: {
     locales: ["ru", "zh"],
@@ -89,7 +89,7 @@ export default {
 
 <TabItem value="ts" label="TypeScript">
 
-```js title="/src/admin/app.ts"
+```ts title="/src/admin/app.ts"
 export default {
   config: {
     locales: ["fr"],
@@ -136,7 +136,7 @@ export default {
 
 <TabItem value="ts" label="TypeScript">
 
-```js title="/src/admin/app.ts"
+```ts title="/src/admin/app.ts"
 export default {
   config: {
     locales: ["fr"],