STORM-1615 WIP Added Simplified Chinese and Traditional Chinese to the list of

languages supported by viewer.

Language codes: zh (Traditional Chinese), zh_CN (Simplified Chinese).

Changes:
* Added both languages to the dropdown menu in Preferences / General.
* Added a couple of "translated" XUI files for zh_CN to create the necessary folders.

indra/newview/skins/default/xui/en/panel_preferences_general.xml

@@ -90,6 +90,16 @@
          label="日本語 (Japanese) - Beta"
          name="(Japanese)"
          value="ja" />
+        <combo_box.item
+         enabled="true"
+         label="简体 (Simplified Chinese) - Beta"
+         name="Simplified Chinese"
+         value="zh_CN" />
+        <combo_box.item
+         enabled="true"
+         label="正體 (Traditional Chinese) - Beta"
+         name="Traditional Chinese"
+         value="zh" />
     </combo_box>
     <text
  font="SansSerifSmall"

indra/newview/skins/default/xui/zh_CN/floater_buy_currency_html.xml

+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<floater name="floater_buy_currency_html" title="BUY CURRENCY (TODO: Translate to Simplified Chinese)"/>

indra/newview/skins/minimal/xui/zh/menu_script_chiclet.xml

+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<menu name="ScriptChiclet Menu">
+	<menu_item_call label="Close (TODO: translate to Traditional Chinese)" name="Close"/>
+</menu>

indra/newview/skins/minimal/xui/zh_CN/menu_script_chiclet.xml

+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<menu name="ScriptChiclet Menu">
+	<menu_item_call label="Close (TODO: translate to Simplified Chinese)" name="Close"/>
+</menu>