[WIP] Nominations form updates

[chimon2000]

• [x] Display a message to nominators if they enter a child that is older than fourteen years old. It will still allow the user to submit the form.
• [x] Move "reason for nomination" away from child; put on head of household section instead. Make a required field.
• [x] Change child age calculation to be based on their age on Christmas instead of the current date.
• [x] Add text around the wishlist text area to only enter toys that are under $50
• [x] Change "# in household" to "Number of kids being nominated"
• [ ] When submitting the form, check whether the number of children actually entered does not match the number entered in the Number of kids field, alert the user of the discrepancy. We don't want to automatically calculate the number of children nominated; the field serves as a double-checking tool for the nominator.