use notification people link for likes.... it should now get refactored, but it works nicely now, even with I18n

really no string concatenation and proper pluralization in notifications helper AKA THE REASON I DIDN'T WANTED TO TOUCH THIS STUFF

Take out some of the concatenation from NotificationsHelper.  VSO languages will still be impossible, but our Caucasian friends should now be able to have valid sentences here.  I don't particularly like passing a translation into a link helper which is passed into a translation.

add application helper to notification helper spec, made the link an object_link rather than status_message_link