[6.x] Ensure "Stop Impersonating" string is translated correctly (#12456)

Co-authored-by: Jason Varga <jason@pixelfear.com>

Author: duncanmcclean

resources/views/impersonator/terminate.blade.php

@@ -86,5 +86,5 @@
             ></path>
         </g>
     </svg>
-    {{ __('Stop impersonating') }}
+    {{ __('Stop impersonating', locale: $locale) }}
 </a>

src/Http/Middleware/StopImpersonating.php

@@ -4,6 +4,7 @@
 
 use Closure;
 use Illuminate\Http\Response;
+use Statamic\Facades\User;
 
 class StopImpersonating
 {
@@ -43,8 +44,14 @@ private function injectLink($response)
     {
         $content = $response->content();
 
+        $locale = User::find(session()->get('statamic_impersonated_by'))->preferredLocale();
+
+        // Make locale config with dashes backwards compatible, as they should be underscores.
+        $locale = str_replace('-', '_', $locale);
+
         $link = view('statamic::impersonator.terminate', [
             'url' => route('statamic.cp.impersonation.stop'),
+            'locale' => $locale,
         ])->render();
 
         return $response->setContent(str_replace('</body>', $link.'</body>', $content));