>> http://git.trinitydesktop.org/cgit/tde-i18n/tree/tde-i18n-pl
> What is the repository address that I can actually clone with git?

If you want to clone the entire GIT repo use:  	git clone http://scm.trinitydesktop.org/scm/git/tde
If you want to clone only tde-i18n use:  	        git clone http://scm.trinitydesktop.org/scm/git/tde-i18n
	
The whole repo will take several hours to clone (>6-8 hours for sure).
tde-i18n should be around 2-3 hours I think.

Cheers
  Michele