Added text option for number-display

This will allow users to set the text attached with a number-display. (TO DO) Pluralization of text, (https://github.com/blakeembrey/pluralize) can be helpful.
This only allows setting one of the html's at a time, no? The user should be able to set all at once. Also, the usual practice is for methods to act as a getter if no arguments are given (see most other functions for an example).