Merge pull request #1432 from manfer/enhance-copy-clipboard

Enhance copy clipboard

templates/ng/base/head.tmpl

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html{{if .BrowserSupportsCopy}} class="is-copy-enabled"{{end}}>
 	<head data-suburl="{{AppSubUrl}}">
 		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
         <meta http-equiv="X-UA-Compatible" content="IE=edge"/>