Fixed some weired toString beviour

ref #39 #6

src/models/enums/PermissionTargets.ts

@@ -4,6 +4,6 @@ export enum PermissionTarget {
     TEAM = 'TEAM',
     TRACK = 'TRACK',
     USER = 'USER',
-    GROUP = 'USERGROUP',
+    USERGROUP = 'USERGROUP',
     PERMISSION = 'PERMISSION'
 }