Reposition grades description

[forcemagic]

The current grade description looks weird with its date as a kind of "title".

These are the components of a grade in order of importance:

• The grade itself (1-5)
• Grade type (this should be the "title")
• Grade theme (if present, subtitle line 1)
• Teacher (subtitle line 1, concatenate w/ a dash)
• Date (subtitle line 2)