Add new user groups to Spanish Wikiquote

User rights defined as agreed upon by the community;
see bug for URL with on-wiki consensus.

Sysops will be able to add users to and remove them
from all new user groups, and, as requested, to add
to and remove from the 'confirmed' user group.

Bug: 62911
Change-Id: I00e0c905acd0ca7273ef6ae67be0e6edf2a9b603