Segment not translated "is already on this list" on the user's list page

Platform (Android, iOS, Website): Website

App version number, if a mobile app issue (shown under Settings or About):

Browser, if a website issue (Firefox, Chrome, etc) : Safari

URLs (aka web addresses) of any relevant observations or pages:

Screenshots of what you are seeing:

Description of problem: pink English error message in the French interface

Step 1: trying to add to a list a species that already is in that list

Step 2:

Step 3: