I am on JustHost a very close relative of Bluehost and have run the permissions you suggest Irosenvall. I still get the “Undefined” message displayed on all popups as well as a good number of column headers and labels.
The installation I have is a fresh install of 7.10.7
In the past month, on this exact server, I have run an instance of 7.9.x with permissions set that did not cause the “undefined” labels. The installation is no longer available or I would look there for permissions guidance.