fixes #2290 add user's language prefix to the PEM link

admin/plugins_installed.php

@@ -113,10 +113,16 @@ foreach($plugins->fs_plugins as $plugin_id => $fs_plugin)
     }
   }
 
+  $url_to_replace = array(
+    'http://piwigo.org/ext',
+    'https://piwigo.org/ext'
+  );
+  $visit_url = str_replace($url_to_replace, PEM_URL, $fs_plugin['uri']);
+
   $tpl_plugin = array(
     'ID' => $plugin_id,
     'NAME' => $fs_plugin['name'],
-    'VISIT_URL' => $fs_plugin['uri'],
+    'VISIT_URL' => $visit_url,
     'VERSION' => $fs_plugin['version'],
     'DESC' => $fs_plugin['description'],
     'AUTHOR' => $fs_plugin['author'],