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It's professional to send it in BOTH languages.

According to whom?

It was said that the Larian team is multi-lingual... and most of the time they speak English... and the job opening is in English, too. So, the best would be to contact them in English and not in two or even more languages.

Nigel Powers: "There are only two things I can't stand in this world. People who are intolerant of other people's cultures... and the Dutch!"