Changes in 0.5.2:
-----------------
* Removed extra gettext import for better performance  (Don Scorgie)
* Fixed bad syntax in a srcdir directory thing         (Shaun McCance)
* Added missing db2html-bibliography to the build      (Peter Williams)
* Added missing GPL and LGPL copyright files           (Shaun McCance)
* Implemented the following numbering systems:         (Shaun McCance)
  Arabic decimal
  Chinese simplified
  Chinese traditional
  Japanese
  Thai decimal
  Thai alphabetic
  Serbian alphabetic
  Greek Ionic
* Updated translation:
  cs      (Miloslav Trmac)
  en_CA   (Adam Weinberger)
  gl      (Ignacio Casal Quinteiro)
  gu      (Ankit Patel)
  ja      (Takeshi AIHANA)
  nb      (Kjartan Marass)
  no      (Kjartan Marass)
  zh_CN   (Funda Wang)