upgrade chess module
simplify round API
tweak future error logging
fr "français" translation #4262. Author: thib.
es "español, castellano" translation #4265. Author: garo.
ru "русский язык" translation #4273. Author: Andrey2888.
hu "Magyar" translation #4290. Author: Anonymous.
de "Deutsch" translation #4305. Author: Anonymous.
nl "Nederlands, Vlaams" translation #4313. Author: Anonymous.
update todo
serve fully annotated pgn
fix pgn game urls