German translation updates (#6846)

core/groups/app_menu.php

@@ -4,9 +4,9 @@ $y=0;
 	$apps[$x]['menu'][$y]['title']['en-us'] = "Group Manager";
 	$apps[$x]['menu'][$y]['title']['en-gb'] = "Group Manager";
 	$apps[$x]['menu'][$y]['title']['ar-eg'] = "مدير مجموعة";
-	$apps[$x]['menu'][$y]['title']['de-at'] = "Gruppenleiter";
-	$apps[$x]['menu'][$y]['title']['de-ch'] = "Gruppenleiter";
-	$apps[$x]['menu'][$y]['title']['de-de'] = "Gruppenleiter";
+	$apps[$x]['menu'][$y]['title']['de-at'] = "Gruppenverwaltung";
+	$apps[$x]['menu'][$y]['title']['de-ch'] = "Gruppenverwaltung";
+	$apps[$x]['menu'][$y]['title']['de-de'] = "Gruppenverwaltung";
 	$apps[$x]['menu'][$y]['title']['es-cl'] = "Administración de Grupos";
 	$apps[$x]['menu'][$y]['title']['es-mx'] = "Administración de Grupos";
 	$apps[$x]['menu'][$y]['title']['fr-ca'] = "Gestion des groupes";