Update release notes for 3.12.7 release

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Translation updates for 3.12.07 release

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Increment version for 3.12.7 release

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>