callback whenever closing modal

src/app/settings/settingsTwoStepAuthenticatorController.js

@@ -91,7 +91,18 @@
             }).$promise;
         }
 
+        var closing = false;
         $scope.close = function () {
+            closing = true;
             $uibModalInstance.close($scope.enabled);
         };
+
+        $scope.$on('modal.closing', function (e, reason, closed) {
+            if (closing) {
+                return;
+            }
+
+            e.preventDefault();
+            $scope.close();
+        });
     });

src/app/settings/settingsTwoStepDuoController.js

@@ -75,7 +75,18 @@
             };
         }
 
+        var closing = false;
         $scope.close = function () {
+            closing = true;
             $uibModalInstance.close($scope.enabled);
         };
+        
+        $scope.$on('modal.closing', function (e, reason, closed) {
+            if (closing) {
+                return;
+            }
+
+            e.preventDefault();
+            $scope.close();
+        });
     });

src/app/settings/settingsTwoStepEmailController.js

@@ -97,7 +97,18 @@
             }).$promise;
         }
 
+        var closing = false;
         $scope.close = function () {
+            closing = true;
             $uibModalInstance.close($scope.enabled);
         };
+
+        $scope.$on('modal.closing', function (e, reason, closed) {
+            if (closing) {
+                return;
+            }
+
+            e.preventDefault();
+            $scope.close();
+        });
     });

src/app/settings/settingsTwoStepU2fController.js

@@ -102,10 +102,16 @@
         }
 
         $scope.close = function () {
+            closed = true;
             $uibModalInstance.close($scope.enabled);
         };
 
-        $scope.$on('modal.closing', function (event) {
+        $scope.$on('modal.closing', function (e, reason, isClosed) {
-            closed = true;
+            if (closed) {
+                return;
+            }
+
+            e.preventDefault();
+            $scope.close();
         });
     });

src/app/settings/settingsTwoStepYubiController.js

@@ -99,7 +99,18 @@
             return str;
         }
 
+        var closing = false;
         $scope.close = function () {
+            closing = true;
             $uibModalInstance.close($scope.enabled);
         };
+
+        $scope.$on('modal.closing', function (e, reason, closed) {
+            if (closing) {
+                return;
+            }
+
+            e.preventDefault();
+            $scope.close();
+        });
     });

src/app/settings/views/settingsTwoStepYubi.html

@@ -38,7 +38,7 @@
             </p>
             <p>Supported platforms:</p>
             <ul>
-                <li>Web vault on a device with a USB port.</li>
+                <li>Web vault on a device with a USB port that can accept your YubiKey.</li>
                 <li>Browser extensions.</li>
                 <li>
                     Android on a device with