If you are a Thai person and want to translate articles into English which is the language that your 2-requesting, you need to interpret it as a first language, which means that the Thai language is enough.
If you are Thailand and then to translate that into English as a second language by translating it into an object, you must be your first language. This means that in Thailand
If you are a people to translate articles in English which is a second language. You will need to translate it into your first language Which means the language itself.