STORM-513 : pull into viewer-development

indra/newview/llfloaterpreference.cpp

indra/newview/llfloaterpreference.h

.../newview/skins/default/xui/da/panel_preferences_sound.xml

.../newview/skins/default/xui/de/panel_preferences_sound.xml

.../newview/skins/default/xui/en/panel_preferences_sound.xml

.../newview/skins/default/xui/es/panel_preferences_sound.xml

.../newview/skins/default/xui/fr/panel_preferences_sound.xml

.../newview/skins/default/xui/it/panel_preferences_sound.xml

.../newview/skins/default/xui/ja/panel_preferences_sound.xml

.../newview/skins/default/xui/pl/panel_preferences_sound.xml

.../newview/skins/default/xui/pt/panel_preferences_sound.xml