Thank you for your question!
In order to host a bilingual community, we have the Translation App21 available. This app will recognize content posted in a language different from the primary community language set and will provide a translation sign under the content for people to utilize. This app is available for all communities and can be accessed under Admin Settings > Apps.
Alternatively, we also have the Multilingual App22 which enables users with the ability to change the community language within their account settings to their language of choice. This app can also be accessed under Admin Settings > Apps, however is only available for Premium and Enterprise plans15.
In addition to the apps mentioned above, you could also create multiple groups within your community that is language-specific. An example of this can be seen here17 where the community is divided into groups ("channels") specific to language/ region.