how to change terminal-lang to english utf-8?

running opensuse linux 12.2

how to force the terminal in opensuse linux

to show all in english utf-8

how to accomplish this?!

Well, if you just want to change it for the current terminal, type:

export LANG=en_US.UTF-8

If you want this for all terminals, add the above line to your ~/.profile file.

You can also change the language of your whole system in YaST.
See also:
openSUSE 12.3: Chapter 11. Changing Language and Country Settings with YaST