Admin can now customize who can use machine translation, it is not
longer only allowed for logged in users.

We check permissions anyway and now it is possible to define permissions
for not logged in users.

Currently translated at 27.9% (264 of 947)

Currently translated at 98.7% (935 of 947)

This allows to control privileges for anonymous users.

Currently translated at 100.0% (947 of 947)

Currently translated at 100.0% (947 of 947)

Currently translated at 100.0% (947 of 947)

Currently translated at 99.8% (945 of 947)

Currently translated at 99.6% (943 of 947)

Currently translated at 98.9% (937 of 947)

Currently translated at 99.8% (945 of 947)

Currently translated at 99.3% (940 of 947)