Changes in 0.17.2:
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* Added build magic for Mallard documents
* Fixed various validity errors in the Mallard spec
* Created a (not yet complete) DocBook->Mallard reference
* Fixed various problems with the Mallard RNG schema
* Various additions to (still incomplete) Mallard spec
* Fixed DocBook menuchoice seperator in RTL, #579278
* Install xml2po modes in /usr/lib/python2.x/ to respect FHS, #528099 (Arun Raghavan)
* Remove ending dot in translator-credits comment [xml2po], #398541 (Claude Peroz)
* Make all xml2po modes inherit from basic mode (Claude Peroz)
* Fixed typos in xml2po man page, #586089 (Claude Peroz)
* Updated translations:
  de      (Mario Blättermann)