Remove unused method.

app/Support/Http/Controllers/RequestInformation.php

@@ -119,19 +119,6 @@ trait RequestInformation
         return '<p>' . trans('firefly.route_has_no_help') . '</p>'; // @codeCoverageIgnore
     }
 
-    /**
-     * Get user's language.
-     *
-     * @return string
-     */
-    protected function getLanguage(): string // get preference
-    {
-        /** @var string $language */
-        $language = app('preferences')->get('language', config('firefly.default_language', 'en_US'))->data;
-
-        return $language;
-    }
-
     /**
      * Get a list of triggers.
      *