For my first trials, I am willing to retrieve translations of words between French and German. I did manage to get "random" translations following the SPARQL examples.
But then I tried a more specific search to find translation of Suisse (Switzerland in english), and couldn't find the translation.
I'm not too familiar with the data, either. But it seems to me that these translations have not been extracted properly from Wiktionary. I've also seen much room for improvement in the German Wikipedia translation extraction.