zeroThis plural form is used for numbers like: 0
%{actors} commented on your %{post_link}.
otherThis plural form is used for numbers like: everything else
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.
%{actors} commented on your %{post_link}.