The site you have looked at refers to Teaching English as a Foreign Language (TEFL)
You need to have a working knowledge of the host country's language in order to teach your own language. These short courses at the TEFL school will give you a certificate that says you are capable of teaching English language to non english speaking persons. If you enquire at a TEFL college they will send you the details and the requirements to enrol on one of their courses. You can find them on the Web.