Bad-words filter only works for roman character

Description:

The bad-words filter, only seems to respect roman characters.

I could imagine this is because the default regex is used in the library:

https://github.com/web-mech/badwords/blob/e15b99e41ebf794503148b80699914ebcf12f173/lib/badwords.js#L21

There is a mention of multi-lingual support with an example in the project README.md:

var filter = new Filter({ replaceRegex:  /[A-Za-z0-9가-힣_]/g }); 
//multilingual support for word filtering

Steps to reproduce:

1. Go to admin UI → Message

2. Now set ...

   • "Allow Message bad words filtering" to True
   • "Add Bad Words to the Blacklist" to test,example,Привет

3. Save configuration

4. Go to any channel and send a message with the content: test,example,Привет

Expected behavior:

All of the configured "bad words" should be censored:

frdmn: ***,*******,******

Actual behavior:

frdmn: ***,*******,Привет

Server Setup Information:

• Version of Rocket.Chat Server: 0.70.4
• Operating System: Cloud
• Deployment Method: Cloud
• Number of Running Instances: Cloud
• DB Replicaset Oplog: Cloud
• NodeJS Version: Cloud
• MongoDB Version: Cloud

Additional context