Yes, the Magento2 marketplace module and their add-ons support all the LTR and RTL languages. If you want to change the language of the module then you can change the module keywords.

To translate the module language let’s say 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” and translate all the keywords under that CSV file and save it. After editing the CSV file you can upload it to the servers where you have installed the Magento2 Marketplace.The module will get translated to the German Language.