How to cite a French thesis in an international journal?
A bibliographical item should allow people to find the referenced work. This means that you should at least report the original title. Alongside the original title, you can add a translation, usually enclosed in brackets (this is not an issue for the thesis of interest because it's written in English). Other elements, like the university name, should not be translated, and you probably don't need to report the school name (but this depends on the bibliographical style).

Thus, I would cite that thesis as follows:


  Aina Frau Pascual, Statistical models for the analysis of ASL and BOLD
  Magnetic Resonance modalities to study brain function and disease,
  PhD thesis, Université Grenoble Alpes (2016).