[translations] import previous translation with kbabel

[Augustin]

Hello,

I am trying to translate some contrib modules into french.

My problem is that I don't know how to import a previous, obsolete 
translation in order to jump start a new up to date translation.


I used potx-cli.php to extract the .pot file.
I can make:
	cp general.pot po/fr.po
I know how to use kbabel to make a brand new translation (open fr.po 
with kbabel, translate, save). 

Now, suppose I have 
* fr.po  -> brand new, empty .po file generated by potx. 
* fr-old.po -> previous, obsolete, incomplete translation.


How do I import (with kbabel) the strings from the previous 
translation into the new one?

I have been searching (the web and drupal.org) but couldn't find the 
answer.


thanks,




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Augustin
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