Ability to close livechat rooms

LingoHub Update 

Manual push by LingoHub User: Gabriel Engel.
Project: Rocket.Chat

Made with  by https://lingohub.com

Less reactive livechat app

Correct GitLab service name

fix message composing help

Fix code highlight on code that contains delimiter

Enables favorite rooms to non-admins

GitLab, not Gitlab :)

[ci-skip]

Katex as well as multiple line help was not being shown
because of a typo and a missing function.

Fix for markdown heading of non Latin characters

Adding copy to clipboard button

Automatic language detect on code blocks

Fixes Rocket.Chat #3035

Fixes #2747

Swipe with flex panel breaks

Add e-mail template options