Feature module Twenga 2.0

Feature module Twenga 2.0
At the [line 683](https://github.com/PrestaShop/PrestaShop-modules/pull/337/files#diff-ba726d3fa91a0569bbc6e05eb7f675eaR683), you change the value of $isoUser if it equals 'gb'. This test will never return true.