i18n: lang configuration hack removal
i18n: lang configuration hack removal

* Removes an old hack for Invenio 1.x that loads utf-8 version of the
  list of languages instead of unicode. (addresses #2967)

Signed-off-by: Leonardo Rossi <5460ec99b71a72e7693c4088b5c2585e76e1c857@cern.ch>

inveniosoftware/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base,tiborsimko/invenio-base