Changes in 2.31.5:
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* New "Read Later" feature
* Support for proposed XDG help: URI scheme
* Use entire search path when loading Mallard docs
* Updated for new yelp-xsl common HTML output
* New bookmarks editor window
* Man pages are back again
* Recognize Mallard docs by index.page.stub in editor mode
* Fix for incorrect bookmarks titles when switching docs
* Updated translations:
  de    (Mario Blättermann)
  es    (Jorge González)
  et    (Ivar Smolin)
  gl    (Fran Diéguez)
  he    (Yaron Shahrabani)
  nb    (Kjartan Maraas)
  sl    (Matej Urbančič)
  zh_CN (Funda Wang)