Fix format string

[CI skip]
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/translation.py

@@ -705,7 +705,7 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
         '''
         Commits any pending changes.
         '''
-        self.log_info('check commit', author)
+        self.log_info('check commit %s', author)
         # Get author of last changes
         last = self.get_last_author(True)