settings: Read config from replica.my.cnf

Change-Id: I26da65203c064e5cc87760a6847dbe18e91ccc96
Use spaces instead of underscores in display of page title

* Using underscores is nicer fo the url, but for the link label
  spaces are better (match rendering by MediaWiki).

* Keep underscores (and other url prettification) by using
  MediaWiki's wfUrlencode logic.

Change-Id: Iea64bda729eacce676476f5252e94482c25e57bf