Term Locals as Object

[derpixler]

at the current solution we work with an array like this:

'locale_relations' => array(
                'en_US' => 13,
                'fr_CH' => 32
            )

A better way is working in this case with an object:

interface W2M\Import\Type\LocaleRelationInterface {

    /**
     * @return int
     */
    public function origin_id();

    /**
     * @return string
     */
    public function locale();
}