New Features for Language Split

Offers dual editor split with single editor support. Support for EN|FR
or FR|EN conversion, either editor usable in dual mode. Requires UOttawa
dual language editor for dual split. Tested under Chrome (PASS), FF15
(PASS), FF20 (FAIL). Note: FF20 randomly fails due to FF issues and not
TinyMCE or wekitcleanup.