A lot of my family memebers have done this, I think if the job is good enough for you to learn that certain language or if you live in that county and kind of have to then yes. This actually happened to me, I was born and raised in the United States and when I was 16 I had to move with my parents to mexico, and I had to learn better Spanish to get a job there so I did learn and I got the job but quit after about a year because I came back to the States. So yes in some situations I do think it's necessary to learn a language to get a certain job.