Backend not working with very old installation

I need to make a small change to a very old website which is running Typo3 7.6.32.
I can login to the backend, but then I get an error message “MenuItem “” is not valid” and all the menu labels are missing. I think it has something to do with the language settings, but as none of the menues work I cannot change anything.
I do not want to go to great length to update this site to a newer version, as the only change I need to make is to say this site is no more valid and give the new contact information. It will completely removed in a few months.
Does anyone have an idea how I can get the Backend working enough to make this one change?