Error message for restricted users

lang/en/error.php

@@ -6,6 +6,7 @@ $string['erroronline'] = 'Error on line $a';
 $string['fieldrequired'] = '\"$a\" is a required field';
 $string['invalidfieldname'] = '\"$a\" is not a valid field name';
 $string['missingfield'] = 'Field \"$a\" is missing';
+$string['restricteduser'] = 'Sorry, but you are currently restricted from doing that.';
 $string['unknowncourse'] = 'Unknown course named \"$a\"';
 $string['usernotaddederror'] = 'User \"$a\" not added - unknown error';
 $string['usernotaddedregistered'] = 'User \"$a\" not added - already registered';

lib/moodlelib.php

@@ -478,7 +478,7 @@ function check_for_restricted_user($username=NULL, $redirect="") {
     if (!empty($CFG->restrictusers)) {
         $names = explode(',', $CFG->restrictusers);
         if (in_array($username, $names)) {
-            error(get_string("restricteduser"), $redirect);
+            error(get_string("restricteduser", "error"), $redirect);
         }
     }
 }