This incorporates changes from cbeck88/spirit-po as of 111402d716b48486b7952bfe58b49fddbdcd9969 and
covers a period of approximately 16 months since the addition of this code to the Wesnoth repo in
June 2016. This also bumps our included Spirit Po version from 1.0.1 to 1.1.2.
I've retained our own changes from:
* fd671b1132
The following changes have been discarded in favor of changes made in the source repo:
* 69b070afb4
* 65dacf6bc7
* ae60ff80e6
* b4dc11ce36