The backend's ImplGetLocale() didn't handle variants, so
ca_ES@valencia ended up as ca-ES instead of ca-ES-valencia, which
made a difference with for example the UI language being set to
Default resulting in only ca instead of ca-valencia, which then
is also written to /org.openoffice.Setup/L10N/ooLocale during
startup and obtained later.

This only for the *iX branch, no idea if and what could be
adjusted for Windows or MacOSX.

Change-Id: I050f6f643571ccdc669fb91b06f3bb516f96e8d5
Reviewed-on: https://gerrit.libreoffice.org/45946Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>