Entities module is requested twice

[DimaIT]

There are two versions of entities lib in package-lock.json:

• htmlparser2 -> entities-6.0.1
• htmlparser2 -> domutils-3.2.2 -> dom-serializer-2.0.0 -> entities-4.5.0

In the frontend bundles having it twice results in 50kb+ overhead, which hurts a bit.

The good news is that latest dom-serializer commit already has entities-6.0.1. Releasing it and updating the dependency chain should fix the issue.