Item12180: Fix Languages tab.  Fix tests of class names to check isa() instead.  Experimental code to cache UI for feedback (disabled for now).  Use simpler HTML when helpless.

git-svn-id: http://svn.foswiki.org/trunk/core@16333 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12180: Foswiki.spec for 16333

git-svn-id: http://svn.foswiki.org/trunk/core@16334 0b4bb1d4-4e5a-0410-9cc4-b2b747904278