Yes, you can sell it! Now many units pay people to translate papers, technical specifications, manuals, popular science literature and so on. Mainly depends on the language, English is now worthless, and now small languages such as German, French and Korean are popular in the south, and mainstream Russian in the north! But I suggest learning more, such as Japan, Russia and Germany, which are very popular at least now and in the next 30 years! It is not easy to remember these three languages, and the grammar should be profound, otherwise it is easy to make mistakes! Doing more translation is helpful to you and exercises your grammar. It's worth doing!