merge two po files

[Florian HEGRON <hogren iiiha com>]

Hello,

I have a problem.

I suscribed few hours ago to help to translate in french the 
gtkmm-documentation.

I don't get the good file. So I worked on the bad file along many times.

I would like to merge my work on the good file without loss.

What is the best way please ?

Thank you !

Regards,