May be use msgmerge ?

My bad, I should probably be generating the git-cola.pot file more often. I believe the workflow is that we are supposed to periodically run make pot to update the git-cola.pot file, commit the result, and then run make po to update the .po files with new/missing translations.

The Makefile defines the make targets/commands, and the files that implement the build_mo (make mo) and build_pot (make pot) commands via setup.py are provided by extras/build_mo.py and extras/build_pot.py.

Let me know if that makes sense. We should document what setup.py is doing under the hood and document the high-level workflow before closing this issue. We should close this issue with a commit that updates README.md with a Translation section that documents the workflow. We'll also document the underlying msgmerge and msgcat commands that are used by the makefile targets so that someone could run the steps manually and see that it's just the standard gettext tools and workflows under the hood.

Thanks for the report.

Thanks ,
I already know how to do it.
But there are some mistakes :

https://github.com/git-cola/git-cola/blob/master/extras/build_pot.py
Line 121 may be need add encoding="utf8"

Maybe in the open(src, 'rU') line, try making it say open(src, 'rb') so that it opens it in binary, and then change the read line to be content = f.read().decode('utf-8'). Please let me know if that works and we'll get that patched ASAP.