I suggest a slight rewording of
MediaWiki:Centralauth-login-global
from: 'Also log me in to other projects of {{int:Centralauth-groupname}}'
to: 'Also log me in to the other wikis of {{int:Centralauth-groupname}}'
One reason is that you log in to a wiki - a project is somewhat different
from a wiki, it is bigger and more abstract.
The reason for the insertion of "the" is that you are logged in to all
wikis.
Version: unspecified
Severity: minor