$form_state does not get passed correctly in i18n_field_field_widget_form()

The argument $form_state in the function i18n_field_field_widget_form() should be passed by reference and not by value.

function i18n_field_field_widget_form($form, $form_state, $field, $instance, $langcode, $items, $delta, $element) {

should be

function i18n_field_field_widget_form($form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {

Passing by value discards all changes that the original 'module_field_widget_form()' (which i18n_field_field_widget_form() redirects through) makes to $form_state.

One direct impact is: #1156468: New translations don't inherit parent field collections (field_collection)

Patch follows