Merge pull request #13860 from twbs/fixes_13346

Add a variable for .dl-horizontal's offset

less/type.less

@@ -219,13 +219,13 @@ dd {
   @media (min-width: @grid-float-breakpoint) {
     dt {
       float: left;
-      width: (@component-offset-horizontal - 20);
+      width: (@dl-horizontal-offset - 20);
       clear: left;
       text-align: right;
       .text-overflow();
     }
     dd {
-      margin-left: @component-offset-horizontal;
+      margin-left: @dl-horizontal-offset;
     }
   }
 }

less/variables.less

@@ -836,6 +836,8 @@
 @blockquote-border-color:     @gray-lighter;
 //** Page header border color
 @page-header-border-color:    @gray-lighter;
+//** Width of horizontal description list titles
+@dl-horizontal-offset:        @component-offset-horizontal;
 
 
 //== Miscellaneous