Issue #2086463 by Jalandhar, cr0ss, jdanthinne: No colon needed for options labels.

core/modules/system/css/system.theme.css

@@ -109,7 +109,7 @@ abbr.form-required, abbr.tabledrag-changed, abbr.ajax-changed {
   content: ':';
 }
 .form-type-radios .container-inline label:after {
-  content: none;
+  content: '';
 }
 .form-type-radios .container-inline .form-type-radio {
   margin: 0 1em;