function $translateMissingTranslationHandlerLog ($log) {

  'use strict';

  return function (translationId) {
    $log.warn('Translation for ' + translationId + ' doesn\'t exist');
  };
}
@ngdoc object
@name pascalprecht.translate.$translateMissingTranslationHandlerLog
@requires $log

@description
Uses angular's `$log` service to give a warning when trying to translate a
translation id which doesn't exist.

@returns {function} Handler function