Fix window title unknown

The (source) window title was broken. Even if 'unknown' was shown the map entry was empty. The only way to resolve this was to create a function for the getting the title (update to getTargetUrl.xql). While doing this an noticing that this will also impact other places that work with local:getLocalized... I introduced a gerneralized function to util.xqm that detects the namespace and returns the title. Works for several MEI-Versions. I also updated other modules using this function so we can manage this centerallized.

Tested. Could be merged before the release.