Disabled Accept-Language feature for PhantomJS

Until PhantomJS is upgraded to version 1.9.2 Accept-Language feature
will fail:

https://integration.wikimedia.org/ci/job/mwext-browsertests-UniversalLan
guageSelector-phantomjs/95/console

Change-Id: I7e923189f3cdcb95fe94d93d0bdf78488f7435c4
Merge "Disabled Accept-Language feature for PhantomJS"