Bug CODE-1580 Font doesn't look good
・Changed preview to be valid HTML 3.2. The swing/html class are made to use such HTML rather than XTML. The file was not valid XHTML either.
Issue#: CODE-1580

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@21083 ef53c05b-3124-4d59-ae7d-fe3273f42be7