Fix #555

public/ng/css/ui.css

@@ -366,6 +366,9 @@ dt {
 .grid-4-5 {
   width: 80%;
 }
+.btn {
+  white-space: nowrap;
+}
 .btn-small {
   font-size: 10.8px;
   padding: .4em .9em;

public/ng/less/ui/form.less

@@ -1,9 +1,8 @@
 @import "var";
 
-// colored buttons
+// Button.
 .btn {
-  &:hover {
-  }
+    white-space: nowrap;
 }
 .btn-small {
   font-size: 0.9*@baseFontSize;