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This fixes a problem where non-Latin users would have to configure their fonts specially to be able to type non-Latin characters (assuming they could figure out why they were typing gibberish). It also fixes a problem where LABEL would draw gibberish on the screen until SETLABELFONT was called appropriately (again, assuming someone knew the magic number to pass SETLABELFONT).

This change also replaces a few magic numbers with their symbolic names for a font's default.