How to add a translation file
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To add a translation file in linphone project you should first :
	- change the variable ALL_LINGUAS in configure.ac by adding the language (ex: fr)
	- then add the file .po in the directory /po
	- run ./autogen.sh

Update the translation files 
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To update all the translation files, in the directory /po run the following command 
	$ make update-po