How can I edit the text range a comment in Writer is linked to?
I’m using LO 5.0.2.2 de-DE on Ubuntu 14.04.03 64bit, also German locale.
It may be easiest to delete and re-add the comment with the range you want. You can copy the comment text and then paste it to the new comment.
Another method is to save the document as an .fodt (plain text format). Open that .fodt file in a plain text editor, search for the <office:annotation-end …/> tag and move that to the desired location.