Updated Serbian translation
Updated Danish translation
Clarify expectations with error codes like G_IO_ERROR_FAILED

If an error code enumeration is expected to be extended in the future,
people shouldn't compare explicitly against its generic "FAILED" value.

https://bugzilla.gnome.org/show_bug.cgi?id=726775
gio/tests/socket: skip IPv6 tests on IPv6-less machines

https://bugzilla.gnome.org/show_bug.cgi?id=667468
GLib 2.40.0