Compress JPEG & PNG images and WPML

tiny-compress-images-wpml.php

<?php
/*
Plugin Name: Compress JPEG & PNG images and WPML
Description: Synchronizes localized images
Version: 0.0.2
*/

add_action( 'updated_tiny_postmeta', 'wpml_updated_tiny_postmeta', 10, 3 );

function wpml_updated_tiny_postmeta( $post_id, $meta_key, $meta_value ) {
	$trid = apply_filters( 'wpml_element_trid', null, $post_id, 'post_attachment' );
	if ( $trid ) {
		$attachments   = apply_filters( 'wpml_get_element_translations', array(), $trid, 'post_attachment' );
		$attached_file = get_attached_file( $post_id );
		foreach ( $attachments as $language_code => $attachment ) {
			// Check if file is different for localized image
			$localized_file = get_attached_file( $attachment->element_id );
			if ( $attachment->element_id != $post_id
			     && $localized_file == $attached_file ) {
				update_post_meta( $attachment->element_id, $meta_key, $meta_value );
			}
		}
	}
}