Don't automatically reset language files if there's an error

[pnxl]

Is your feature request related to a problem? Please describe.
If there's a parsing error in the language file, it is automatically reset and all changes to a language is lost. This is frustrating when there are so many tedious changes that have to be made again.

Describe the solution you'd like
Either:
a. A sanity checker command in the plugin to check the language file
b. A faulty configuration halts the plugin from loading (or the language entirely).

Describe alternatives you've considered
Downloading the file after every change, but that's tedious and people tend to forget.

Additional context