IE8 unsupported message

Had to go low-tech.  IE8 doesn’t make it far enough for a nicely styled
homepage with unsupported message.
Fixed goals not showing up when reloading level.
Started A/B test for whether the AnnouncesAction and take-damage audio help.
Fixed #1868. Fixed #1846. Made sure that home view slogan always fits in all languages.
Merge branch 'master' into production