Is it possible to combine two .po translation files together?

Question

We have two .po files, each from different branches of a piece of software.

We need to combine these into a single .po file.

There are duplicates between the two

Answer 1

I use msgmerge:

msgmerge [old_file.po] [new_file.po] > output.po

It works for me, but be aware that it does a silly merge, it is, it discards the entries in the old_file (new file overwrites old one).