Thx ginoledesma for your support.
There was no such file in my home directory called .bash_profile so I created it according to your previous messsage. It looks like this:
echo "export LC_CTYPE=en_US.UTF-8" >> ~/.bash_profile
echo "export LANG=en_US.UTF-8" >> ~/.bash_profile
I am not sure where the problem is but mybe it is because I am using German keyboard and my default language (language bar) is also German (just to find some characters easily).
It is really impossible to use Terminal because for example if I type ds in terminal it countinues like this forever (until I stop it with Control + C):
dsssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssss
P.S. Use option key as meta key is unchecked (I realized how to save new settings

)
Thx once again for your kind help!
V.