Move loading from HTML to a background thread

[planarvoid]

Fix

This PR creates a version of the fromHtml method which runs on the background thread. This makes the entry loading much faster.

Test

1. Test with the DO PR

Review

@danilo04

Make sure strings will be translated:

• [x] If there are new strings that have to be translated, I have added them to the client's strings.xml as a part of the integration PR.