NCHK-2794 ePubCheck should look for position:fixed properties in styles ...

@apond 

...as these break CSS Multicolumn layout

Epubcheck was checking for this but only on epub v3.  left the version check only on teh direction and unicode-bidi properties as they were valid under epub 2. 

Fixed up the message file to remove "v3" out of both the English and Japanese versions of the message.