This is Linux - there's always more than one way :-) On specific pages you will see a 'Translate this Page' link above the language bar. However, I think you are asking for an overview, so there are two easy ways to see that.
Use the'Translation Statistics' link in the sidebar - ensure that your language code is entered on that page and you should then see all available pages listed - that is, all pages already marked for translation.
Alternatively, load http://techbase.kde.org/Special:PageTranslation.
The advantage of the first method is that you can see which pages are 100% translated to your language, and which pages are partly translated or not at all.