Modernize i18n
This modernizes i18n, updates the CMake version to 3.5 and also fixes #65 (closed).
Note the translation handling of indicator/*.desktop.in
was a bit weird, it used some trickery to extract the Name
but didn't merge it back, but had X-Ubuntu-Gettext-Domain
set. So it looks like the name is supposed to be translated by something, although I'm not sure what since it's NoDisplay=true
.