Otherwise, this updates all .po files for all line numbers that changed
since the last time updatepo.sh was run. We still add the filename, but
this information shouldn't change too often.
xgettext beginning with 0.18.4 supports this feature.
potfile=po/minetest.pot
xgettext --package-name=minetest \
--sort-by-file \
- --add-location \
+ --add-location=file \
--keyword=N_ \
--keyword=wgettext \
--keyword=fgettext \