Make Instructions Text Simpler

"1. Drag the slider to the right until it is..."
->
"1. Move the slider until it is..."

because what if the slider has already been moved to the left
of the item's cost?
Make Text Larger for Item Name, Cost...

User asked to have text larger for students who have difficulties
reading small text.  User is occupational therapist Teresa Wagelie,
requested over email after student had difficulty.

* Item Name, Item Cost, Message, Instructions, and Play Again text
have been made much larger.
* Messages have been split over two lines (using \n in string)
when necessary.
* Considering making number line text larger too.  Will require
experimentation.