Revert "Add language settings button inside dropdown for non-content pages"

This reverts commit 5d576d05b4.

Reason for revert: Using Skin::getTemplateData method outside the
skin rendering layer is dangerous and likely a performance issue as
it means generating the rendering data twice and makes various hooks
execute multiple times.
It has caused T326538 and may be causing other issues.

Bug: T326538
Change-Id: Ie5d079deae414eb199d2a40b98d04b57439eaac4

resources/css/ext.uls.interface.less

@@ -70,7 +70,3 @@
 		margin: 1em 0;
 	}
 }
-
-.empty-language-selector__language-settings-button {
-	margin: 12px;
-}