Empathy 3.9.1 Fixes Six Bugs and Updates Translations

Empathy 3.9.1 is here to fix six issues reported by testers from previous versions. Among them we can mention that the icon names were updated, and a spelling mistake: “You need to setup an account…??? Moreover, this version remembers the audio output status in the call window, adds missing math.h header to the libempathy library, fixes audio call icon in help, and the ???Link Contacts” user documentation.