Hi, according to the log file, the problem could be related to the langage file. But I don't know if the problem is on steam side, Windows side or X-Plane side. And I'm not even sure it comes from there. (I'm not affiliated to Laminar Research).
If I were you and had a fast enough internet connection, I would remove and reinstall X-plane via Steam interface, with no scenery at first, so that it's only 10Gb to download. If everything works as expected, then I would install the scenery I want...