A quick news to tell you the forum will be unavailable from Tuesday, July 15, 2014.
We don't know yet the duration of the break, probably few days ...
For the curious, this maintenance is to reorganise the forum to make it more clear and open internationally. Mainly French, English and German at the moment, as is the case with the website.
You can keep you informed of progress via the dedicated spot on our bug tracker (#161).
Edit: The maintenance is complete and the forum is back online!