Feature summary (what you would like to be able to do and where):
Like how WikiEditor syntax highlights the colon, also do something similar for the semicolon, which is the term before the definition in definition lists.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
WikiEditor currently doesn't highlight semicolon lines at all

Benefits (why should this be implemented?):
Better syntax highlighting