The Image field title is not properly rendered in Multilanguage sites

Content translation to other languages doesn't render properly in "image" titles. The following HTML code is shown as "Image <span class="translation-entity-all-languages">(tutte le lingue)</span>"

<a class="panel-title" href="#edit-field-intrument-image--content" role="button" data-toggle="collapse" aria-pressed="true" aria-expanded="true" aria-controls="edit-field-intrument-image--content">Image <span class="translation-entity-all-languages">(tutte le lingue)</span></a>

I'm using Boostrap 8.x-3.0-rc1. In my bootstrap configuration I have the "Use the administration theme when editing or creating content" option disabled.

TIA