CMS Made Simple Forums

OK, this is a very strange thing.
When I try to change the strftime in the Comments-module, it does NOT print the date but some crazy nonsense.

I put this tag inside my News-template:
{cms_module module='comments' modulename='News' pageid='$entry->id' dateformat='%e %B %Y, %H:%M' lang='nl_NL'}

Then, on the page where it should print the date, it prints:
%Europe/Berlin %722 %2009, %18:%Jun

The exact same thing happens with the Formbuilder, when it tries to print a birth-date. So it's not in the comments-module, I think my CMS is fucked up somewhere. How do I solve this?

OK, I found out the comments-module only works with the date() format... But in the modulehelp it literally says that you can also set strftime(). Guess it's a bug? Why am I the only one with this problem??
I want to put the date in my own language, but this seems to be impossible.