Feature: #97778 - Support of language direction in ckeditor

See forge#97778

Description

The configuration contentsLangDirection of the ckeditor is used to define the direction of the content. It is now filled by the direction defined in the site language of the current element.

As fallback the page TSconfig configuration RTE.config.contentsLanguageDirection = rtl can be used.

Impact

The direction of the content inside the RichText element is defined by the language of record.