Add menu for selecting the level font

By default, when you open the level editor to start a new level, the
level font will now match your VVVVVV language; so if you're, say,
Japanese, then you can make Japanese levels from the get-go. If you
want to make levels for a different target audience, you can change the
font via a new menu (map settings > change description > change font).
The game will remember this choice and it will become the new initial
level font.

desktop_version/fonts/font.fontmeta

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <font_metadata>
+    <display_name>english/…</display_name>
     <width>8</width>
     <height>8</height>
     <white_teeth>1</white_teeth>