Notification: No PLURAL and SINGULAR when user(s) comments my Story Post (in Cluster)

Hello.
When ONE user comment my story post (in Group) or FEW users comment my story post (in Group), system always display notification with the same language line.

I beleave it should be _PLURAL and SINGULAR variations when somebody comment.

Few or all of this:

APP_GROUP_STORY_USER_POSTED_COMMENT_ON_USERS_POST="%1$s commented on {b}%2$s's{/b} post"
APP_GROUP_STORY_USER_POSTED_COMMENT_ON_YOUR_POST="%1$s posted a comment on your post"

I suppose the same with Event's & Pages story's posts.

Thanks.