Alter .po files in ways no sane mind would think about
msghack [OPTION] file.po [ref.po]
msghack can be used to alter .po files in ways no sane mind would think about.
It can swap msgid and msgstr in a PO file, remove all translations in order to convert a translation file into a template file, and can also append the contents of one PO file to another.
-o FILE
Write the result to FILE.
--invert
Invert a po file by switching msgid and msgstr.
--master
Join any number of files in a master-formatted catalog
--empty
Empty the contents of the .po file, creating a .pot.
--append
Append entries from ref.po that don't exist in file.po.