Clarify description for admin/users/edit.php

Bug #913506

Enhance the description for the "disable email" per-user option.

Change-Id: Ib45c6060417bc3c4d9074ebfc5929b980f8cadbc
Signed-off-by: Chris Wharton <chrisw@catalyst.net.nz>

htdocs/admin/users/edit.php

@@ -106,7 +106,7 @@ if ($USER->get('admin')) {
 $elements['maildisabled'] = array(
     'type' => 'checkbox',
     'defaultvalue' => get_account_preference($user->id, 'maildisabled'),
-    'title' => get_string('email'),
+    'title' => get_string('disableemail', 'admin'),
     'help' => true,
 );
 $elements['expiry'] = array(

htdocs/lang/en.utf8/admin.php

@@ -645,6 +645,7 @@ $string['youcannotadministerthisuser'] = 'You cannot administer this user';
 $string['usernamechangenotallowed'] = 'The chosen authentication method does not allow changes to the username.';
 $string['passwordchangenotallowed'] = 'The chosen authentication method does not allow changes to the password.';
 $string['thisuserdeleted'] = 'This user has been deleted.';
+$string['disableemail'] = 'Disable email';
 
 // Add User
 $string['adduser'] = 'Add User';