Messages must be posted in English as it is not possible for us to moderate the forums otherwise. In very specific cases (such as distributing a translation), foreign languages may be used provided an English translation is provided as well.
At a guess.. are you saying you have TaigaChat installed and a member can change the title which shows just above the shoutbox? The Message of the Day? If so, there is a setting for which usergroups can do that. You might want to check it.
Only if you assume that they're referring to illegal downloads. The site doesn't appear to be online at ps3crack.fr. Without full information, I'm not willing to jump to a conclusion on what their site is about - I've discovered many times that the site name doesn't always reflect the content.
IF there are illegal downloads on the site, this is what the license agreement states:
You are solely responsible for ensuring that Your Content and Your use of the Software complies with all applicable legislation and regulations, including but not limited to all applicable Data Protection and Privacy legislation. You undertake to ensure that the Software is not used by You or others to engage in illegal activity. You may not use the software to engage in any activity that would violate the rights of third parties. You hereby agree to indemnify Us from any loss or damage arising from Your breach of this provision.