Deprecated Polylang functions

$polylang->model->get_post_language() is called in includes/class-metaboxes.php and also in the translate-rewrite-slugs library includes/libraries/translate-rewrite-slugs.php

Suggested to use PLL()->model->post->get_language() instead. There is a pull request here for the library https://github.com/KLicheR/wp-polylang-translate-rewrite-slugs/pull/35

Thanks.

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