Single quote breaks code syntax coloring

Summary

While viewing code changes in commit section, if there is some text in the code with only one single quote, all the code after that line are shown in red colour, which is not expected. I suppose it only happens when there are no double quotes surrounding the said text.

Steps to reproduce

Commit some code that contains this portion of code: -> Hello world. This is Sammy's project and blah blah blah. Go to the commit section and see the changes, all the text after the apostrophe(') is shown in red.

Example Project

None

What is the current bug behavior?

All the text content after a single quote are coloured in red.

What is the expected correct behavior?

The syntax colour should remain consistent throughout the code

Relevant logs and/or screenshots

Screenshot:

Output of checks

The bug happens on Gitlab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)