implementation of Sound DB

Client sounds are cross-referenced with as many other DB-Types as possible. Including, but not limited to:
 * Character VOs (Errors, Emotes)
 * Creature VOs (Boss Dialogue)
 * Zone Music and Ambience
 * Sounds triggerd by spells
 * Sounds from general item/spell usage, creature behavior

Restrictions:
 * only one locale is supported. Choose wisely!

localization/lang.class.php

@@ -25,6 +25,7 @@ class Lang
     private static $quest;
     private static $race;
     private static $skill;
+    private static $sound;
     private static $spell;
     private static $title;
     private static $zone;