It describes anything centred on or in England, including the language.
 
Englishcentric just ain't a word.. least in my OED on-line
( Rapitinui comes in a wrapper of cellophane, Thu 17 Apr 2008, 1:13, archived)

Yes, you are correct. Englishcentric is not a word.

( Cockweasle Vile Emperor, Thu 17 Apr 2008, 2:09, archived)