Merge branch '5481-spf-button-admin' into 'develop'

Resolve "SPF modification error with user account"

Closes #5481

See merge request ispconfig/ispconfig3!1612

interface/web/dns/form/dns_txt.tform.php

@@ -170,7 +170,7 @@ $form["tabs"]['dns'] = array (
 	)
 );
 
-if($_SESSION["s"]["user"]["typ"] == 'admin') {
+if($app->auth->is_admin()) {
 	unset($form["tabs"]['dns']['fields']['data']['validators']);
 	$form["tabs"]['dns']['fields']['data']['validators'][0]['type'] = 'NOTEMPTY';
 	$form["tabs"]['dns']['fields']['data']['validators'][0]['errmsg'] = 'data_error_empty';

interface/web/dns/templates/dns_spf_edit.htm

@@ -53,7 +53,9 @@
             
         <div class="clear"><div class="right">
             <button class="btn btn-default formbutton-success" type="button" value="{tmpl_var name='btn_save_txt'}" data-submit-form="pageForm" data-form-action="dns/dns_spf_edit.php">{tmpl_var name='btn_save_txt'}</button>
+            <tmpl_if name="is_admin">
             <button class="btn btn-default formbutton-default" type="button" value="{tmpl_var name='btn_edit_as_txt_record_txt'}" data-load-content="dns/dns_txt_edit.php?id={tmpl_var name='id'}&zone={tmpl_var name='zone'}&edit_raw=1">{tmpl_var name='btn_edit_as_txt_record_txt'}</button>
+            </tmpl_if>
             <button class="btn btn-default formbutton-default" type="button" value="{tmpl_var name='btn_cancel_txt'}" data-load-content="dns/dns_soa_edit.php?id={tmpl_var name='zone'}&next_tab=dns_records">{tmpl_var name='btn_cancel_txt'}</button>
         </div></div>