Transparently support maxlag=5
Multiple changes: misspellings, sorting, robust "do pages exist" etc.

* Handle some misspelled language names
* Sort the language list
* Robust "do pages exist" (re-request if not all info was retrieved)
* Support [[link|link text]] in translation
* Handle translation section starting with '''heading'''
* Reverse log
* Set maxlag=2
* Tweak summary message
* Update defaults