Expand refs constraints to include valid characters

Fixes #4831, #4865, #4932

fixed maximum avatar size in changelog

More label fixes

Show branches list (which branches contains commit) on commit page

Print the configured GitLab user on the Admin-Sidekiq page

Show only processes owned by the GitLab user on the Admin-Sidekiq page

Remove text-shadow from code blocks for all themes

Fix typo in sample smtp settings

set maximum filesize for avatar on profile page correct

"Created on" should be used when the timestamp is only a date.

Typo fix in show.html.haml

Update 6.1-to-6.2.md

Ensure that highlighted code blocks never get a text-shadow regardless of where they are or what theme is used.

Personl -> Personal

Added a few enters so markdown can process the code (without adding bash in front of it)

Minor grammatical updates in some of the labels.

Add specs for NotificationsHelper