string quotation in legacy syntax definitions

[randy3k]

In the syntax definitions,
string quotations " and ' are not marked as a part of a string and bracket highlighter fails to work on them.

[FichteFoll]

I see. Will consider it when I work on this the next time (in conjunction with #37).

[FichteFoll]

I honestly don't care about the legacy syntax anymore, but feel free to submit patches.