Displays with the wrong caracters set

Hello,

The widget displays the “gospel of the day” with the wrong caracters set (UTF?): the text has then unreadable special letters.
This appears only from time to time at the opening of the main page, but only with this widget. Others widgets works good.
Is that a bug?
Can you solve that problem within the widget?
Thank you in advance.

Here is a screen copy
https://drive.google.com/open?id=1oqkNLP-CSjABlxtdr-lN9jCE7-qL9vYt

The page I need help with: [log in to see the link]