The documentation suggests this exception is isolated to web player builds but we are getting it on desktop builds. Maybe that much data can't be stored in the registry in one key on windows or something.
The player prefs is not the place to store bulk data like this. Reaching the limit of pref storage in this way will likely also break the storage of other pref data completely unrelated to localization.
I would recommend downloading and caching data to a standalone file in Application.persistentDataPath(which would incidentally be easier to support multiple sources)
You are right, most games don't have that much text, so I have never experienced a limit, but playerPrefs its indeed not the best place to store the downloaded data.
I will route it to a file and upload a new build to the beta folder!
Thanks for reporting this!!
Are you Give I2L 5 stars!
Are you Please lets us know how to improve it!