First, please update the plugin to the latest v1.7.0 (released today).
Then you can use our new [alg_wc_ev_translate] shortcode when setting texts in the plugin settings, e.g.:
[alg_wc_ev_translate lang="EN"]Text for EN[/alg_wc_ev_translate][alg_wc_ev_translate lang="DE"]Text for DE[/alg_wc_ev_translate][alg_wc_ev_translate not_lang="EN,DE"]Text for other languages[/alg_wc_ev_translate]
The shortcode is WPML and Polylang compatible. I’m sure it will work for the notices displayed on site, however, I have my doubts if it will work properly in the emails. Could you please test it and let me know if it’s working as expected?