Add Traditional Chinese language files

And another new language!

This uses the same font as Simplified Chinese. As such, I changed the
displayed name of the font (in the level editor) from 简体中文 to 中文.

desktop_version/fonts/font_sc.fontmeta

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <font_metadata>
-    <display_name>简体中文</display_name>
+    <display_name>中文</display_name>
     <width>12</width>
     <height>12</height>
     <white_teeth>1</white_teeth>