zeroThis plural form is used for numbers like:  0
Unlimited users
oneThis plural form is used for numbers like:  1
%{count} user
otherThis plural form is used for numbers like:  everything else
%{count} users
Unlimited users and projects
%{count} user, unlimited projects
%{count} users, unlimited projects
Unlimited users
%{count} user
%{count} users
Unlimited users and projects
%{count} user, unlimited projects
%{count} users, unlimited projects