Merge branch '6634-error_msg' into 'develop'

Include required errorMsg ID for submitUploadForm to process it.

Closes #6634

See merge request ispconfig/ispconfig3!1843

Author: Till Brehm

interface/web/dns/templates/dns_import.htm

@@ -59,7 +59,7 @@ <h1>
 				</div>
 			</tmpl_if>
 			<tmpl_if name="error">
-				<div class='alert alert-danger clear'>
+				<div id='errorMsg' class='alert alert-danger clear'>
 					<div class='alert-label'>
 						<strong>
 							<tmpl_var name="error_txt">