After changing language to English, my URL appears as http://erp.88k.com.tw/en_US/page/homepage. I'm migrating from Magento, so to keep all my URLs consistent I need to change this to http://erp.88k.com.tw/en/page/homepage. I assume this is the locale code being inserted into the URL, but I can't edit the locale code on Settings->Translations->Languages->English. Anybody have experience with this?