So you need to translate some plugin or theme to your native language and have been handed one of those pesky .pot / .po files?
You're lucky the plugin at least supports language files, but unlucky that you now have a mountain of small lines to translate. You could download a tool like [poedit][1] and slog through the translation, but I felt there has to be a way to populate the file with at least some of the required translation, saving some of the grunt work. Fortunately Google delivers (although oddly I did not find the link through my initial google search!)
Google translate has a workbench for PO files: http://translate.google.com/toolkit/list?hl=en#translations/active
Obviously you need a Google account. This tool gives you a simple side by side workflow where you can see the original and edit the translation, but more importantly: Google will make a best effort attempt to translate your file for you!