polib allows you to manipulate, create, modify gettext catalogs (.pot, .po and
binary .mo files). You can load existing files, iterate through it's entries,
add, modify entries, comments or metadata, etc... or create new po/pot files
from scratch.

polib provides a simple and pythonic API, exporting only two convenience
functions 'pofile' and 'mofile', and the 4 core classes: POFile, MOFile,
POEntry and MOEntry for creating new files/entries.