Html entities should be decoded after translation

Problem/Motivation

Html entities don't get decoded after translation which will create issues in plane text fields.

Steps to reproduce

• On a site with English and French installed create an english node with the title "The Drupal Association".
• Use Atomatic Translation to create the french version

The title of the new node will be "L'association Drupal"

Proposed resolution

Use Drupal\Component\Utility\Html::decodeEntities() on the returned translation.