Fix description when locked by system

CHANGELOG.txt

@@ -27,6 +27,7 @@ Changelog
  * Fix: Debounce and optimise live preview panel to prevent excessive requests (Sage Abdullah)
  * Fix: Use constant-time comparison for image serve URL signatures (Jake Howard)
  * Fix: Ensure taggit field type-ahead options show correctly in the dark mode theme (Sage Abdullah)
+ * Fix: Fix the lock description message missing the model_name variable when locked only by system (Sébastien Corbin)
  * Docs: Document how to add non-ModelAdmin views to a `ModelAdminGroup` (Onno Timmerman)
  * Docs: Document how to add StructBlock data to a StreamField (Ramon Wenger)
  * Docs: Update ReadTheDocs settings to v2 to resolve urllib3 issue in linkcheck extension (Thibaud Colas)

CONTRIBUTORS.rst

@@ -720,6 +720,7 @@ Contributors
 * Kevin Chung (kev-odin)
 * valnuro
 * Vitaly Babiy
+* Sébastien Corbin
 
 Translators
 ===========

docs/releases/5.1.md

@@ -56,6 +56,7 @@ Thank you to Damilola for his work, and to Google for sponsoring this project.
  * Make it possible for speech recognition users to reveal chooser buttons (Thibaud Colas)
  * Use constant-time comparison for image serve URL signatures (Jake Howard)
  * Ensure taggit field type-ahead options show correctly in the dark mode theme (Sage Abdullah)
+ * Fix the lock description message missing the model_name variable when locked only by system (Sébastien Corbin)
 
 ### Documentation
 

wagtail/locks.py

@@ -53,7 +53,10 @@ class BaseLock:
         """
         Returns a description of the lock to display to the given user.
         """
-        return capfirst(_("No one can make changes while the %(model_name)s is locked"))
+        return capfirst(
+            _("No one can make changes while the %(model_name)s is locked")
+            % {"model_name": self.model_name}
+        )
 
     def get_context_for_user(self, user, parent_context=None):
         """