Indeed. There’s only 14 threads now about the subject. Any search for gnome-terminal or locale will find them, I’m sure.
'Course, that’s only helpful if people actually search before posting…
sorry I have no idea about this stuff, how do I know which locals I want to have? I have a german keyboard but operating system language is american english. So far I just removed the hashs from all lines that start with de_de, but that did not solve it for me yet (I did the sudo locale-gen)
Depends … 
Would you like your system in german (menus, messages …)?
Then you need the german locale
Are you american?
Then you want the en_US.UTF-8 locale
This or some other english locale - you should be able to tell by the name.
The difference is often the default units that are used plus some, as the name says, local specialties.
You don’t need a german locale to use a german keyboard - that is just a matter of keyboard layout.
I mostly boot a live system after having selected the german keymap - else z and y are swapped and many symbols are at different keys than what is written on them.
But the system language is still english then.
It doesn’t hurt to have more than one - but OTOH - why have stuff you never intend to use …?
Always prefer UTF-8 locales!
1 Like
thanks for the detailed answer!! now after adding the en_US.UTF-8 it worked!
Bingo!