Translate shipping method text

I have two shipping methods (Premium and Standard) that I would like to translate from German to English.
There is no snippet for the values I want to translate.
In php, inside the change_shipping.tpl file, those texts are {$dispatch.name}
How can I translate them?

Use the globe, right to the field.

The value of „Standardversand“ is not found in the Snippets in /backend.
That’s why I don’t know where to find it so I can translate it…

Use them: