Replace old use of $lang by l10n function.

git-svn-id: http://piwigo.org/svn/trunk@2201 68402e56-0260-453c-a942-63ccdbb3a9ee

include/common.inc.php

@@ -184,7 +184,7 @@ load_language('local.lang');
 // include/user.inc.php)
 if (is_a_guest())
 {
-  $user['username'] = $lang['guest'];
+  $user['username'] = l10n('guest');
 }
 
 // template instance
@@ -213,13 +213,13 @@ if (isset($user['internal_status']['guest_must_be_guest'])
 
 if ($conf['gallery_locked'])
 {
-  $header_msgs[] = $lang['gallery_locked_message'];
+  $header_msgs[] = l10n('gallery_locked_message');
 
   if ( script_basename() != 'identification' and !is_admin() )
   {
     set_status_header(503, 'Service Unavailable');
     @header('Retry-After: 900');
-    echo $lang['gallery_locked_message']
+    echo l10n('gallery_locked_message')
       .'<a href="'.get_absolute_root_url(false).'identification.php">.</a>';
     exit();
   }
@@ -250,7 +250,7 @@ SELECT id
 
 if (is_adviser())
 {
-  $header_msgs[] = $lang['adviser_mode_enabled'];
+  $header_msgs[] = l10n('adviser_mode_enabled');
 }
 
 if (count($header_msgs) > 0)