Currently it is only possible to offer your branchbob shop in english or german. For this reason your customer doesn't have the opportunity to choose between the two languages. But an option is to open up two similar shops, one in english, one in german. If you are linking the shops mutually in the cover page text saying that the german/english shop is available under the following link, your customer can choose his favourite option. Important to know is that self-entered product descriptions and texts are not automatically being translated with switching the language (this just counts for buttons and tabs).
Both languages are to be selected under "Settings" > "Language"

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