Force git lang to english for ungit

[jung-kim]

fixes #959

[campersau]

Maybe you can try LANG=en_US.UTF-8 && git?
On windows the syntax will be: set LANG=en_US.UTF-8 && git
But I haven't tested it because I use english git.

child_process.spawn already sets the env to process.env and ungit already sets the lang in bin/ungit

[jung-kim]

On second thought, this is actually more complicated than my original thought. I think even in different linux versions language specification is handled differently and it is not always guaranteed.

Not to mention I can't even test this in Windows machine.

I would need more thought around this but for now we would have to simply document this.

[campersau]

Just for reference: ungit already sets the env variables here https://github.com/FredrikNoren/ungit/blob/master/bin/ungit#L20

See also:
#694
#676
#176

[jung-kim]

So I've saw that and read some doc on node child process but this means that that env variable is not working. If it was applied as one would have thought we wouldn't have #959 issue to begin with.

It is possible to add LC_ALL, LANG or any other keys but for whatever reason I couldn't successfully change git lang in my mac book and thus I couldn't really validate the fixes.