Add externalization and fix regression in shortcuts helper modal

app/views/help/_shortcuts.html.haml needs to be externalized.

There was also a regression introduced here that removed the section specific classes so that those sections no long display on their respective pages.

For example

The following discussion from !30144 (merged) should be addressed:

  • @leipert started a discussion: (+3 comments)

    @jboyson Should those be externalized?

    Also funny for me, this is in merge request and issue shortcuts, right? ? doesn't show any of those for me:

    Screenshot_2019-08-01_at_23.59.05

Edited by Thomas Randolph