Update translations and fix syntax.

i18n/en.i18n.json

@@ -644,6 +644,7 @@
   "r-when-a-member": "When a member is",
   "r-when-the-member": "When the member",
   "r-name": "name",
+  "r-when-a-attach": "When an attachment",
   "r-when-a-checklist": "When a checklist is",
   "r-when-the-checklist": "When the checklist",
   "r-completed": "Completed",