Make prefs-advancedediting more consistent

Cf. "Advanced options", "Display options" etc.
<https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Prefs-advancedediting/pt-br>

Change-Id: I35608d99eff9a95a14bc12ace8de9a8e1dd808a1
Merge "Make prefs-advancedediting more consistent"