chore: Translate djangojs.po in fr_CA

99% of minimum 50% translated source file: 'djangojs.po'
on 'fr_CA'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/edx-platform/conf/locale/fr_CA/LC_MESSAGES/djangojs.po

@@ -3730,9 +3730,9 @@ msgstr "Affectation de cohorte non autorisée : {email_or_username}"
 #: lms/static/js/groups/views/cohort_editor.js:291
 msgid "There was an error when trying to add learners:"
 msgid_plural "{numErrors} learners could not be added to this cohort:"
-msgstr[0] ""
-msgstr[1] ""
-msgstr[2] ""
+msgstr[0] "{numErrors} apprenant n'a pas pu être ajouté à cette cohorte :"
+msgstr[1] "{numErrors} apprenants n'ont pas pu être ajoutés à cette cohorte :"
+msgstr[2] "{numErrors} apprenants n'ont pas pu être ajoutés à cette cohorte :"
 
 #: lms/static/js/groups/views/cohort_editor.js:306
 msgid "View all errors"