As the people on this forum are very helpful to me, I reckon I could do something back. So hereby, I present to you, the Dutch translation of Construct 0.98.5: http://drop.io/construct
There doesn't seem to be an option yet to change language, so you'll just have replace the English text files to use it, it seems. Correct me if I'm wrong.
I hope this helps someone.
Edit: bug found: when I use my translation, the Object Categories don't work anymore.
Edit: bug 2 found: when I use my translation, the Object Properties don't work anymore.