Is your feature request related to a problem? Please describe.
Currently i've got more than 60 Highlighter entries and it's getting worse to keep track (i'm losing overview).

Describe the solution you'd like
I'd wish an Error-Notification if an entry already exist.

Describe alternatives you've considered
Or at least an option to list the Highlighter entries alphabetical, so i can check it myself if there's something double.

Thank you!