Option to Edit English language

I was trying to change some texts myself and adapt it to my personal use of the code (great by the way, thanks! )

So I though I could use the languages, to change some small things on the english without affecting the rest.

But I have not been able to make the english file en.json work on my install.

Steps to reproduce

1. Add en.json to the folder of languages
2. Force en language on config.

What happens

Nothing.

What should happen

Use my en.json language instead of the defaults