Update en.json

[cucholix]

Lower case some chars to keep consistent style, upper cased abbreviations.
Could be conflicts with var names? Please review.

[ITotalJustice]

I probably won't rely on translations to fix naming inconsistencies. Instead I'll just rename the strings directly, and then update the translations to match the updated strings. Doing it this way will mean anything not translated will return the correct English text and won't break any translations as the key (left side text) will be updated.

I'll keep this open until I get around to fixing it 😄