Language tests
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  >>> from plone.app.i18n.locales.interfaces import IContentLanguages
  >>> from plone.app.i18n.locales.interfaces import IMetadataLanguages
  >>> from zope.component import queryUtility

  >>> util = queryUtility(IContentLanguages)
  >>> util
  <ContentLanguages at ...>

  >>> languagecodes = util.getAvailableLanguages()
  >>> len(languagecodes)
  1

  >>> u'en' in languagecodes
  True

  >>> id(languagecodes) == id(util.languages)
  False

  >>> old = util.getAvailableLanguages()
  >>> util.setAvailableLanguages((u'en', u'de'))
  >>> util.getAvailableLanguages()
  [u'en', u'de']

  >>> util.setAvailableLanguages(old)

  >>> old = util.combined
  >>> combined = ['de-de']
  >>> util.setAvailableLanguages(combined, combined=True)
  >>> languagecodes = util.getAvailableLanguages(combined=True)
  >>> len(languagecodes)
  2

  >>> id(combined) == id(util.combined)
  False

  >>> util.setAvailableLanguages(old, combined=True)


  >>> util = queryUtility(IMetadataLanguages)
  >>> util
  <MetadataLanguages at ...>

  >>> languagecodes = util.getAvailableLanguages()
  >>> len(languagecodes)
  1

  >>> u'en' in languagecodes
  True