When editor error is displayed, underline 'here' to draw attention to it.

[dmorgant]

Underline 'here' in the generic error message shown in the editor when the code expected is not correct:

Reported as part of user review: https://ibm.ent.box.com/notes/357464733535?s=xd8grnzempji580yomgw7zm8gwug4c62