chore: Translate django.po in fr_CA

99% of minimum 50% translated source file: 'django.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/django.po

@@ -13013,7 +13013,7 @@ msgstr ""
 
 #: xmodule/library_content_block.py:535
 msgid "Source content library has not been specified."
-msgstr ""
+msgstr "La bibliothèque de contenu source n'a pas été spécifiée."
 
 #: xmodule/library_content_block.py:539
 msgid "Content libraries are not available in the current runtime."