Remove informations about why the pagination didn't work.

We remove a couple of informations to lower the exposition of our internals.

rest_framework/pagination.py

@@ -186,7 +186,7 @@ class PageNumberPagination(BasePagination):
 
     template = 'rest_framework/pagination/numbers.html'
 
-    invalid_page_message = _('Invalid page "{page_number}": {message}.')
+    invalid_page_message = _('Invalid page.')
 
     def paginate_queryset(self, queryset, request, view=None):
         """

tests/test_pagination.py

@@ -113,7 +113,7 @@ class TestPaginationIntegration:
         response = self.view(request)
         assert response.status_code == status.HTTP_404_NOT_FOUND
         assert response.data == {
-            'detail': 'Invalid page "0": That page number is less than 1.'
+            'detail': 'Invalid page.'
         }
 
     def test_404_not_found_for_invalid_page(self):
@@ -121,7 +121,7 @@ class TestPaginationIntegration:
         response = self.view(request)
         assert response.status_code == status.HTTP_404_NOT_FOUND
         assert response.data == {
-            'detail': 'Invalid page "invalid": That page number is not an integer.'
+            'detail': 'Invalid page.'
         }