Add language settings button inside dropdown for non-content pages

NOTE: This patch is identical to patch with change-id:
Ifdf2a529b30e5a2df8867b606a525c9f7b3bdb6c

The above patch has been merged but reverted because of the usage
of '$skin->getTemplateDate()' method, which should be avoided. The
current patch replaces the usage of this method, with the usage of
the output page title ($out->getTitle()). All the rest of the code
has been kept the same.

Bug: T316559
Change-Id: Ibef9f6fd46d9055c3e0865905fb8aa8d031c1940

resources/css/ext.uls.interface.less

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