WordPress Multisite Translation

Hello, how i can translate a multisite installation with WordPress Multisite?

a exemple:
i have a multisite installation:

the main site are: mydomain.sites

Than we have subdomains like mydomain.apartments points to apartments.mydomain.site

mydomain.apartments
mydomain.restaurant
mydomain.stores

now we have categories like apartments.mydomain.site/amsterdam /berlin …

what tool i need now to become:
apartments.mydomain.site/en/amsterdam
apartments.mydomain.site/nl/amsterdam
apartments.mydomain.site/de/amsterdam

Best regards
Michael