The limits of plagiarism
Plagiarism is taking the ideas of others and presenting them as your own, whether in their own words or not. By citing the other work you avoid plagiarism, but not necessarily all problems. If you are doing a translation, of the other work, present it as such. I can't give advice on whether that is always valid and it might require some permission of the copyright holder of the earlier work. I suspect that it does, but copyright rules vary widely around the world and, in many places, are a bit more generous for academic work and research. 

Even in a single language, quoting from another work, with proper citation, and paraphrasing the other work with citation avoids plagiarism. But there are limits that are usually a matter of civil law. The more you "use" the shakier the ground gets, but that is a copyright issue, not plagiarism. 

But if it is clear what is your own and what is adopted/adapted from another, you at least avoid plagiarism.