Translation for Accessibility text on HTML field is incorrect in French, needs to be changed.
The translation provided OOB for the Accessibility help text on the HTML fields used in the portal was not the precise translation of the text in French.
The translation for this help text is defined in the sys_ui_message table. In your instance you can find the translation record at the URL below:
You can open this record and change the translation as per your requirement in the Message field and save it. This should correct the translation you see on the portal in French.
You can find the same record on affected instances by navigating to the sys_ui_message table and then searching for the English text - 'In the Following editor' in the Key field.