* [misc] Add comments.

framework/router.class.php

@@ -153,7 +153,7 @@ class router extends baseRouter
             }
         }
 
-        if($this->config->edition != 'open') $this->mergeFlowLang();
+        if($moduleName == 'common' && $this->config->edition != 'open') $this->mergeFlowLang();
 
         /* Merge from the db lang. */
         if($moduleName != 'common' and isset($lang->db->custom[$moduleName]))
@@ -219,6 +219,8 @@ class router extends baseRouter
     {
         if(!$this->checkInstalled() || !$this->isServing()) return;
 
+	/* 12版本升级到付费版时，workflow表不存在。 */
+	/* When upgrading from version 12 to the paid version, the workflow table does not exist. */
         try
         {
             $flows = $this->dbQuery('SELECT * FROM ' . TABLE_WORKFLOW . " WHERE `buildin` = 0 AND `vision` = '{$this->config->vision}' AND status = 'normal' AND type = 'flow' AND `navigator` = 'primary'")->fetchAll();