Allow the user to set highlight without %nick%

My nick is 'dan' on some networks - including german networks. 'dann' is a common word in german so I get push notifications A LOT because %nick% highlights on '*dan*'.

I made "%nick%" the default highlight value and now the user can change it without having %nick% part of the value. This means I can do "_%nick% _%nick%:" or something like that.