use actual label instead of literal "this element"

- "Advanced options for this [element]" instead of "advanced options."
- "Copy [element]" instead of "Copy element"
I also removed some periods because they bugged me, but if somebody
really wants them, I won't fight it.
Merge pull request #88 from oerpub/58426912-58572696-use-element-name

use actual label instead of literal "this element"