Replace placeholder in enrollment email subject

Refactor: Rendering emoji category header in a loop

# Conflicts:
#	.meteor/packages
#	.meteor/versions
#	packages/rocketchat-lib/i18n/en.i18n.json

# Conflicts:
#	.meteor/packages

Add /topic command

Fix message typo.

Instead of listing them one by one.
Refactoring https://github.com/RocketChat/Rocket.Chat/pull/3032

* Continue work started by patcon in #2272 for importing slack again and again without duplicates. Currently errors out. Also fixed #2532 for Slack and HipChat.

* Ignore new slack channel format

* Add ability to upsert messages on sendMessage

* Show a better error for duplicated oembed records

Also adds missing translation keys

Embedding youtu.be shortened links did not have a video preview

- Edit buttons to save and cancel no longer submit the form
- "More channels" link has 100% width again
- Fix "New messages" button to overlaps date division
- Fix "Jump to recent messages" to 100% with again

Fix some eslint errors

New livechat page to send an email when no online agents

Correções na tela de config do LDAP

Algumas strings estavam com a formatação markdown erradas

Easier whole message navigation