Isn't GPLv2 still problematic for websites, unless you want to use GPLv2 for the rest of the website as well?
Now, with the GPLv2, it is possible to use Aloha freely in most websites/webapps. You don't distribute your website/webapp and therefore are not bound by the GPLv2 to divulge your website's source code.
The GPLv2 _would_ take effect if you distribute your website in the traditional sense - a package that someone can run himself.
(IANAL and can't speak for Gentics etc.)