Updated function name to be same tense.

This change is not needed but it makes it more consistent for me.
Changed function name.

Not needed but it is more representative of what it will do rather than
what it did do.
Changed function name and fixed string.

As with other pages I needed to fix the function name to indicate what
it will do instead of what it will do.
Fixed approve/unapprove option.

The option should not show up for the instructor on the instructor post
as it could cause confusion.
Fixed error in information.

A single, simple discussion is the only forum option that doesn't work.