Tweak worksheet with id and attribute fixes
Tweak worksheet with id and attribute fixes

* Re-add [XX] as placeholder text
* Add spans around Django variables to test
* Change avg program debt value to median-student-loan-completers
* Add data-numeric value for estimated years attending
* Add id for regional vs national BLS expenses data
* Fix id name for the gap remaining in cost

mistergone/college-costs,mistergone/college-costs,mistergone/college-costs,mistergone/college-costs