Problem solved!
I had used some special characters in my texts, including quotation marks and “TM” symbols. This seems to have caused problems during export and had to be edited manually.
At the same time, as soon as the file was imported, Excel messed up all the quotation marks: “ became ”". This also had to be corrected in the text file before input.
With a little manual work, the import now works perfectly and I have a first English version of the game.
So the workflow now is:
-> export csv File.
-> Import to excel by clicking "Tabs" as well as "Semicolon" and " quotation marks".
-> Adding the translation
-> export as CSV UTF-8 file with separators
-> manual rework all special characters and replace the "" to " with notepad++
-> import to visionaire
this works fine :-)
(btw: I found some threads which refered to the wiki, but yesterday when I worked on the issue, I tried to use the wiki, which didn`t work. A minute ago I tested it again and the wiki worked again.)