user: remove make local feature

we discussed a bit on what this does and it's confusing as it stands:

* Use case of this is lost in the realms of time
* Possible guess by is that it was to move users of different Cloudron to a central cloudron
* Currently, the design is a bit flawed because the make user local button doesn’t pin the user. The state is lost in next synchronization.
* Maybe, one should use export/import user for this use case
* Let’s disable this button for now, feature is not complete.

dashboard/src/views/users.js

@@ -717,32 +717,6 @@ angular.module('Application').controller('UsersController', ['$scope', '$locatio
         }
     };
 
-    $scope.makeLocal = {
-        busy: false,
-        user: null,
-
-        show: function (user) {
-            $scope.makeLocal.busy = false;
-            $scope.makeLocal.user = user;
-
-            $('#makeLocalModal').modal('show');
-        },
-
-        submit: function () {
-            $scope.makeLocal.busy = false;
-
-            Client.makeUserLocal($scope.makeLocal.user.id, function (error) {
-                if (error) return console.error('Failed to make user local.', error);
-
-                $scope.makeLocal.busy = false;
-
-                refreshUsers();
-
-                $('#makeLocalModal').modal('hide');
-            });
-        }
-    };
-
     $scope.invitation = {
         busy: false,
         inviteLink: '',