Workaround for WikiCloth bug (?) if wiki syntax used strangely

If you try to create a wiki page with the content
```wiki
=== one ===
== two ==
= three =
```
an exception is raised. The bad thing is that you can not see the link to the edit page then so it can be quite hard to undo this. Here I suggest a quick and dirty workaround in order to allow for a nice rendering of the edit link.

i18n is broken anyway for the wiki. (Should I open an issue for that?)