Bug 48081: Fix relative internal wiki link labels

Relative internal wiki links were showing the wikitext rather than their
traditional label.

Also, a path in getWikiLinkTargetInfo() was not being reached when href
was being normalized.

Change-Id: Ic5eb06b8b4992e5bcc97dceff0ab67d4ff356deb
Merge "Bug 48081: Fix relative internal wiki link labels"