Expand highlighting support for syntaxhighlight module

Part of the ongoing effort to expand the amount of languages that can be
highlighted by syntaxhighlight module to match that of SyntaxHighlight
GeSHi extension.
The module now separates language names with their file names.

Change-Id: Iaf907ebeadc9432719a45f4e9e8d580bb32ca668
Merge "Expand highlighting support for syntaxhighlight module"