Ticket #38918: 38918.2.diff

src/wp-admin/includes/plugin.php

@@ -891 +891 @@
                 set_site_transient( 'update_plugins', $current );
         }
 
-        if ( ! empty($errors) )
-                return new WP_Error('could_not_remove_plugin', sprintf(__('Could not fully remove the plugin(s) %s.'), implode(', ', $errors)) );
+        if ( ! empty( $errors ) ) {
+                /* translators: %l: Plugin filename or comma separated list of plugin filenames */
+                $message = _n( 'Could not fully remove the plugin %l.', 'Could not fully remove the plugins %l.', count( $errors ) );
+                return new WP_Error( 'could_not_remove_plugin', wp_sprintf(
+                        $message,
+                        $errors
+                ) );
+        }
 
         return true;
 }