Change LANG env var to 'C' before calling 'git'

The plugin fails if locale is set for instance to LANG=de_DE.UTF-8,
so git output is German:

> LANG=de_DE.UTF-8 git remote show -n origin
* externes Projektarchiv origin
  URL zum Abholen: ...
  URL zum Versenden: ...

Reported by Jakob Voss
Bump version to fix compile test