You can choose the main language you want when creating the panel:
Later you can change main language in Settings.
If you want to have multi-language system, in Settings please specify all the languages you want.
Then in downloaded panel you will have a language switcher dropdown in top-right corner.
Translations for all languages are performed by the community, any customer can go to Settings -> Manage translations and edit their own language(s), we don't guarantee the correct translations.
Finally, if you want to have your Models translated with forms in several languages, QuickAdminPanel doesn't support that out-of-the-box. But we've written a detailed article/instruction how to easily install Laravel Translatable package for that.