Zope-level language negotiation

[malthe]

The z3c.pt package relies on Zope's language negotiation utility zope.i18n.INegotiator but plone.i18n does not register such a utility, instead relying on Zope's own negotiation logic which is not the same as plone.i18n.

The result is that different languages may be used on the same page.

For example, the following simply uses the Plone-negotiated language:

from zope.interface import implements
from zope.i18n.interfaces import INegotiator

class Negotiator(object):
    implements(INegotiator)

    def getLanguage(self, langs, env):
        """Return the language that's already set up by Plone."""

        return env.get('LANGUAGE', 'en')

negotiator = Negotiator()

[jensens]

would be an enhancement of plone.i18n - PRs welcome.