If you create a drawing and a question mark appears "?" instead of Å/Ä/Ö, then this is due to the fact that AutoCAD can't "read" the Swedish language pack. This is all described in the ISO.shx file. What you need to do is to copy and replace the ISO.shx file from the Strusoft folder to the Autodesk folder. In this example, AutoCAD 2019 is used. See the picture below. 

Figure 1: Copy and paste the ISO.shx file from the StruSoft folder to the Autodesk folder.