Looks like a nice little tool, I'd not seen it before.
These are the steps I've just run through to install.
Uncompress the file
bzip2 -d ktranslator-0.4.tar.bz2
Extract the files from the single tar file
tar -xvf ktranslator-0.4.tar
The tar file extracts to a directory called ktranslator-0.4 so go into that
Configure - gets info about your system ready to compile
If the above step failed then it may be that you don't have either the compiler or the required libraries. It worked fine on my system, but you may need to install the QT development libraries first.
Now compile it
Now install it into the system. I have used sudo to run this with root permissions, alternatively run the make install as root
You've now compiled and installed the program
Now it's installed - run the program
The & runs it in the background so that it frees up your terminal
You will need to add a dictionary from http://ktranslator.sourceforge.net/dictionaries.html
. If the file ends in .gz then
tar -xvf filename (without the .gz bit)
bzip2 -d filename
tar -xvf filename (without the .bz2 bit)
If you are still getting problems, then please include the error message so that we can see what the problem is.