confirmation dialog for user removal

frontend-js/src/main/js/gui/admin/UsersAdminPanel.js

@@ -109,7 +109,15 @@ UsersAdminPanel.prototype._createUsersTableRow = function () {
   });
   $(usersTable).on("click", "[name='removeUser']", function () {
     var button = this;
-    return self.removeUser($(button).attr("data")).then(null, GuiConnector.alert);
+    return self.askConfirmRemoval({
+      title: "INFO",
+      content: "Do you really want to remove this user?",
+      input: false
+    }).then(function (param) {
+      if (param.status) {
+        return self.removeUser($(button).attr("data"))
+      }
+    }).catch(GuiConnector.alert);
   });
 
   $(usersTable).on("click", "[name='showEditDialog']", function () {