Fix for button flicker, closes #796

(cherry picked from commit 1f5048acc73c5d803b0f18776c595df1ccc9a757)

Conflicts:
	src/css/bootstrap.dark.min.css
	src/css/bootstrap.light.min.css

src/vendor/bootstrap/less/overrides.less

@@ -192,6 +192,9 @@ form input.ng-invalid {
   left:-34px;
   position: absolute;
   z-index: 100;
+  transition: .25s left;
+  transition-delay: .25s;
+  -webkit-transition-delay: .25s;
 }
 
 .row-open:hover {