Add config to enable compact links for new accounts

By default the value is false.

Change-Id: I30e9c3d929158d9ebe90edfcb10c90712ad294f9

UniversalLanguageSelector.hooks.php

@@ -82,6 +82,19 @@ class UniversalLanguageSelectorHooks {
 		return false;
 	}
 
+	/**
+	 * Sets user preference to enable the Compact language links if the
+	 * user account is new.
+	 *
+	 * To be removed once no longer needed.
+	 */
+	public static function onLocalUserCreated( User $user, $autoCreate ) {
+		if ( RequestContext::getMain()->getConfig()->get( 'ULSCompactLinksForNewAccounts' ) ) {
+			$user->setOption( 'compact-language-links', 1 );
+			$user->saveSettings();
+		}
+	}
+
 	/**
 	 * @param OutputPage $out
 	 * @param Skin $skin