Clarify `Enable Uploads` text.

This change updates the help text next to the `Enable Uploads` setting.

- Current: `Please ensure users having also upload rights`
- Update: `Please ensure that users also have upload permissions`

---

The current help text is a little odd in terms of sentence structure for an English speaker.
The updated version clarifies the meaning.

messages.pot

@@ -2175,7 +2175,7 @@ msgid "Enable Uploads"
 msgstr ""
 
 #: cps/templates/config_edit.html:108
-msgid "(Please ensure users having also upload rights)"
+msgid "(Please ensure that users also have upload permissions.)"
 msgstr ""
 
 #: cps/templates/config_edit.html:112