Hi,
thanks for your post, and sorry for the trouble.
This is not necessarily a problem in TablePress, and using Umlaute in tables is usually no problem. For example, if you type them into the table cells, they should work fine.
The problem here might be the character encoding in the file that you are trying to import. Unfortunately, not all problems save such files (e.g. Excel and CSV files) in the UTF-8 format. That can then lead to the Umlaute not being saved correctly. To check that, please open the CSV file in a text editor like Notepad.
If they do not show up, they were not saved correctly by the program from which you exported the file — and then there’s no way that TablePress can import them correctly, of course.
If they show up fine, this means that your server does not have a certain PHP library installed, that TablePress needs for converting the character encoding to UTF-8 automatically. In that case, you’ll have to do that step manually: In the text editor, please try “Save as” and choose the UTF-8 format. After that, the file should import fine.
Regards,
Tobias
