Hello Piotr,

Thank you for reaching out to us.

Notification templates are not included in the translations mentioned above, so when you access Amelia/Notifications, all templates will be in English. However, if your site is set to German (for example), the de_DE locale will be applied, and Amelia will use the templates you see in Amelia/Notifications, so if you don't translate these, all email notifications will be sent in English.

In cases like this, DO NOT add your language as a secondary language in Amelia. It is the primary language of your website, and Amelia will use it as a primary language.

Since your site is configured to your language in WordPress General Settings (German in this example), you only need to translate the templates you see when you land in Amelia/Notifications. The language drop-down you see in the top right is used only for additional languages (so, if the site is in German, you will add English, Spanish, Dutch, etc) through this menu:

So, if you have issues with emails coming in in English, instead of the language your WordPress site is set to, make sure you haven't added your language as the additional language, and translate the templates you see when you land in Amelia/Notifications.