Wiki AsciiDoc - no syntax highlighting

Summary

Code [source,language] isn't highlighting source code.

Steps to reproduce

• create new page in wiki (AsciiDoc format)
• paste some code in correct tags, e.g.

[[app-listing]]
[source,ruby]
.app.rb
----
require 'sinatra'

get '/hi' do
	"Hello World!"
	end
----

or

[[app-listing]]
[source,c++]
.class.cpp
----
#include <stdio.h>

for (int i=0;i<5;i++){
	std::cout<<"*"<<std::endl;
}
----

• save and display page

What is the current bug behavior?

Syntax is not highlighted

What is the expected correct behavior?

Hightlight syntax.

Output of checks

This bug happens on GitLab.com

/label ~bug