Just to clarify, are you wanting to translate your theme or Shopify Admin into German?
Shopify Theme Language
Although Shopify themes are in English, some themes have more than one language option. These themes include translations of all of the text content in your online stores, such as contact information and cart and checkout information.
If you would like to change the admin language to one of our supported options, you can do so by heading to theSettings > Accounts (or Plans and permissions) > Staff accountsection of your admin. After that, you should be able to choose your preferred language from the drop-down list as shown here:
If you are unable to see the language option within the staff account settings, you can opt-in instead here:
The country where you operate your business can impact how you design your online store and what information you provide to your customers. Regulations, buyer expectations, and language considerations can help determine what information you include on your online storefront and product pages. We have a fantastic guide relevant for merchants selling in Germany which you can check out below:
Moira | Social Care @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog