zeroThis plural form is used for numbers like:  0
%{actors} comentarios en %{post_link} de %{post_author}.
oneThis plural form is used for numbers like:  1
%{actors} comentario en %{post_link} de %{post_author}.
otherThis plural form is used for numbers like:  everything else
%{actors} también han comentado %{post_link} de %{post_author}.