[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

openlibrary/i18n/messages.pot

@@ -5590,7 +5590,7 @@ msgstr ""
 
 #: covers/external_image.html
 #, python-format
-msgid "Or, use the cover from %s"
+msgid "Or, use a cover from %s"
 msgstr ""
 
 #: covers/manage.html