added query builder to filter out venues with no parent place.
added an action to the venue module, that returns a list of langues,
that a certain venue has not yet been translated to.
added a parent-place reference to the venue module.
finished off the venue-panel integration and introduced an extra
'translate' action, which keeps the uuid within the identifier of the
translated document. the copy action in contrast leads to completely new
identifiers. the new translate dialog is aware of the languages that a
certain document has been translated to.
bumped honeybee submodule revision.