we distributed the gw8hp1 client silent by using the setup.cfg

We checked french, german, english, and a few other languages with the
english as default.
After the install, the default is not english but an other language.
Why is this?

Also if I switch one time from this language to the english language and I
want to use the spelling/grammer checker, it does not work.
Every word is underlined.
How to fix this?