Just a note concering translating VM2 language files for payment gateways. If you are located in Europe, it doesn't make sense to translate i.e. the file for the authorize.net payment gateway, because authorize.net doesn't offer their service in Europe. For example, as a german shop owner, you can't open an account with authorize.net. So before you start to translate all language files for payment gateways, please check if the company offers it's service in your country.