Use json

[ospalh]

This one is not an error, but the suggestion of an enhancement.
Instead of writing values into a python file, i would use (simple)json. It's really simple.
You basically say object = json.load(open(json_file_path, 'r')) to get to the values and json.dump(object, open(json_file_path, 'w')) to save them.
An example i used is storing "bad" hash values.
My idea would also be to start without a file and use that to indicate no dictionary selected, like the dict_name='None' you used and use a try: ... json.load(...) to check.

[ospalh]

I just thought of another problem with that bit of code:
Afais different profiles can't use different language dictionaries.
Not sure if that is something you should do something about. But maybe you could store information like that somewhere in the collection. Maybe in the DeckConf.

[ospalh]

Or you could use a .json file in the profile directory. You get the path there as mw.pm.profileFolder().

[ttempe]

In the back of my mind, I knew I had to improve this one feature, but I hadn't thought about it so thoroughly.

Thanks for your tips. It's a great idea to use Json, and a great idea to differenciate profiles.

[ttempe]

mw.pm.profileFolder didn't work (called too early?) so I put it in the add-on dir.

[ospalh]

mw.pm.profileFolder didn't work (called too early?)

Probably. If you want to do the setup per-profile (which imo would be the Right Thing but with a low priority), you could try something like hooks.addHook("profileLoaded", do_the_setup) with a do_the_setup() function.