[Reporting] Editable reports KO when emoticon is present in Squash entities

Affected version : 8.1.1.RELEASE

Steps to reproduce

Have an emoticon in a simple field of an entity (name or reference) and generate an editable report on this object (test or requirement book, campaign or iteration report). The report can be saved and downloaded.

Observed behaviour

It is not possible to open the file in Word. The file opens in Libre Office or Only Office, but the entities containing the emoticon are not in the document. When emoticon is in rich field, non ASCII characters are corrupted.

Expected result

The document must be able to open and display all characters correctly.