update modal footers to use text-align instead of float on buttons for alignment

less/modals.less

@@ -71,13 +71,15 @@
 .modal-footer {
   padding: 14px 15px 15px;
   margin-bottom: 0;
+  text-align: right; // right align buttons
   background-color: #f5f5f5;
   border-top: 1px solid #ddd;
   .border-radius(0 0 6px 6px);
   .box-shadow(inset 0 1px 0 @white);
-  .clearfix();
-  .btn {
-    float: right;
+  .clearfix(); // clear it in case folks use .pull-* classes on buttons
+
+  // Properly space out buttons
+  .btn + .btn {
     margin-left: 5px;
     margin-bottom: 0; // account for input[type="submit"] which gets the bottom margin like all other inputs
   }