[TASK] Fixing language filter for mail queue

Classes/Service/BackendService.php

@@ -221,11 +221,10 @@ class BackendService {
 	public static function getLanguagesForFilter() {
 		$languages = self::getLanguages();
 
-		array_unshift($languages, '');
 		$filterLanguages = [];
-		if (count($filterLanguages) < 0) {
-			foreach ($languages as $key => $value) {
-				$filterLanguages[$value] = $value;
+		if (count($languages) > 0) {
+			foreach ($languages as $language) {
+				$filterLanguages[$language['isocode']] = $language['name'];
 			}
 		}