If you want to change the language of the module then you can change the module keywords. To translate the module language from English to German . You need to follow this path in module unzipped file app/code/Webkul/Marketplace/i18n. Here you can find a CSV file with name “en_US.csv”. Now you need to rename the CSV as “de-DE.csv”. Now you need to open the CSV file and translate all the keywords mentioned under the file to German. After editing the CSV file you can upload it to the servers where you have installed the Magent2 Marketplace. The module will get translated to the German Language.