Translation of Trauschein

Arete means earring. Is it only in Mexico, regional? earring has multiple translations in Spanish, some are regionalism, others not. Arete, pendiente, caravana, and some others. But they are widely understood.
I will be here for another 3 hours, then about 2 hours offline and then again online until late. So the exception is in Spain, cause formal is usually vos/ustedes even when we speak to 1 person. They also jump to the third person singular.
Many thanks for your suggestions. They are very useful. I can't answer your mail now, but I will come back to you later when I'll have more time. I hope that you and your family are well!