If I play LSL7 in for example French, the speech and subtitle text will be all in French, but interface text will be English, for example, Quit is not labelled Quitter, it says Quit. How can I make all the text French? (Or German, or Spanish)

That's right what I want to know too. Any option to set the interface language to the installer language?

That solved the problem, but a new game must be started for the changes to take effect. Lucky me was too tired to play this gem for long yesterday.

Thanks!

Yep, I also have the german version installed ( :p) and loading a "corrupted" savegame makes this right-click menu (the one with the boss! option etc.) appear in german language (which it previously wasn't in), but the system menu (file, game, help) still appears in english.
After deleting the mentioned file (and starting a new game) both menus are german now.

I'm using Vista 64. Possibly the issue's cause?

This works fine, thank you very much!

I have experienced the same problem and I fixed it by doing what you said. However I don't understand why the installer does not do this for me. If I install a game I want to have it install and work at once the way I want. Is the file we need to delete otherwise important or why is it even installed?

LSL Magna cum laude is the italian version? How do play it in English?

The issue has been fixed with the April 15th 2018 update (took some years). The 14.msg file has been removed for all not english version of the game so the menu are now in the same language of the game text. Some useless (and potentially dangerous) files remains in the patch folder, but at least we got rid of the one that messed up with the menu.