Translation generation command (#10794)

additional translatable strings: Filter Settings in settings page and Global Search on all pages.
remove duplicate fr key
also, language file signatures were wrong as I had a testing version of the vue generator

resources/lang/en/commands.php

@@ -33,4 +33,7 @@ return [
         'success' => 'Successfully added user: :username',
         'wrong-auth' => 'Warning! You will not be able to log in with this user because you are not using MySQL auth',
     ],
+    'translation:generate' => [
+        'description' => 'Generate updated json language files for use in the web frontend',
+    ]
 ];