That could be risky. locales can be a pain to fix if you have problems. Unless you really need to i would not bother.Could we ran the locale-purge command again, install the French language pack, and re-run the command?
It should not cause problems. I think you will get all your software in French if you reinstall each software that is in English.What if some softwares dependencies still are configured in English? Will that cause errors for the softwares?
Hopefully you can reinstall it over the top after making a backup of the config files.I haven't managed to reinstall PlayOnLinux yet, that's not standard, since it was installed from a DEB - from the official website.
I should do a backup of the full .PlayOnLinux folder..
Hell, I do NOT want to reinstall Office 2010. XD
That's the worst thing ever. XD That license check could easily freak out, if I reinstall Office completely (That's a legal license).
Good luck and post back if you have any issues