Changes in version 1.7.3
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* Minor updates to documentation.

* Update translations: Hindi [Guntupalli Karunakar], Czech [Miloslav Trmac],
Portuguese [Duarte Loreto], Japanese [Takeshi AIHANA],
British [David Lodge], Spanish [Francisco Javier F. Serrador],
Korean [Changwoo Ryu], Albanian [Laurent Dhima]