Additional alias names of custom emojis not accepted anymore

Description:

According to our docs, it should be possible to add multiple alias names to custom emojis, separated by space character:

Enter a name for your emoji, add space separated list of the aliases for the emoji which can be entered to display the emoji in the chats

This does not seem to be working anymore, the space character will be replaced by a dash instead.

Steps to reproduce:

1. Add a new custom emoji
2. Give it multiple aliases, e.g. first second
3. Hit save, see how the alias gets transformed into: first_second

Expected behavior:

It should separate the alias input by space, as stated in the docs, and accept multiple alias names.

Actual behavior:

Space character gets replaced by dash. Multiple aliases not possible.

Server Setup Information:

• Version of Rocket.Chat Server: 3.4.0
• Operating System: Linux
• Deployment Method: Docker
• Number of Running Instances: Docker
• DB Replicaset Oplog: Yes
• NodeJS Version: Docker
• MongoDB Version: Docker

Additional context

Demo video

Task: DOCS-1320

Start by reproducing the custom emoji creation flow with the documented aliases first second, then trace where the alias input is transformed during save. Compare the saved result with the expected separate aliases and verify that multiple aliases can be entered and used in chat.