README.translators
Evolution is translated like most GNOME projects, by updating the .po files in evolution/po and by translating the help files in evolution/help/C and placing them in a locale specific dir, ie evolution/help/fr. In addition, the default welcome message is in evolution/mail/default/C/Inbox and can be translated by translating the message in the file and also putting it in a locale specific dir, ie evolution/mail/default/fr/Inbox. The file name 'Inbox' should not be changed, as this is an internally defined string (the name in the folder list will still be translated though). The content of the Quick Reference in the "Help" menu can also be translated, see https://bugzilla.gnome.org/show_bug.cgi?id=307856#c3 for a how-to.