VOLDEV-10: Parse the link in the error modal

This is a fix for [VOLDEV-10](https://wikia-inc.atlassian.net/browse/VOLDEV-10), fixing the problem of escaped HTML tags showing up in the error modal on Special:CreateNewWiki.

A test page implementing the same logical structure can be viewed [here](https://gist.github.com/TK-999/6481b67e500eeb17b78b).