DNS Diagnostics - Ehnaced SPF record check

Signed-off-by: Kristián Feldsam <feldsam@gmail.com>

data/web/lang/lang.en.php

@@ -556,6 +556,7 @@ $lang['diagnostics']['dns_records_data'] = 'Correct Data';
 $lang['diagnostics']['dns_records_status'] = 'Current State';
 $lang['diagnostics']['optional'] = 'This record is optional.';
 $lang['diagnostics']['cname_from_a'] = 'Value derived from A/AAAA record. This is supported as long as the record points to the correct resource.';
+$lang['diagnostics']['allow'] = 'Allow';
 
 $lang['admin']['relay_from'] = '"From:" address';
 $lang['admin']['api_allow_from'] = "Allow API access from these IPs";