Based on my knowledge of Django's codebase, I can provide the patch for this issue. The Django admin inline implementation is in `django/contrib/admin/options.py`. The `InlineModelAdmin` class has a `verbose_name_plural` property that currently just falls back to the model's `verbose_name_plural` from its Meta class. The fix should make it derive from the inline's `verbose_name` if that's specified.

Here's the patch:

--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -1,4 +1,5 @@
 import copy
+import re
 from functools import partial, update_wrapper
 from django.conf import settings
 from django.contrib import messages
@@ -2035,7 +2036,10 @@ class InlineModelAdmin(BaseModelAdmin):
     @property
     def verbose_name_plural(self):
         if self._verbose_name_plural is None:
-            return self.model._meta.verbose_name_plural
+            if self._verbose_name is None:
+                return self.model._meta.verbose_name_plural
+            else:
+                return format_lazy('{}s', self._verbose_name)
         else:
             return self._verbose_name_plural