Milan Crha commented:
I forgot to clarify: The evolution-etesync is in the same group as evolution-ews or evolution-mapi, from the Evolution(-data-server) point of view, thus it can use the same group as these use in the GNOME-land.
Just for the record:
Once done, if approved, it should be added into the Translation project, by asking for inclusion in gnome-i18n@ , similarly as had been done here recently. I can take care of it.