Thank you for your question!
In order to host a bilingual community, we have the Translation App33 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 App39 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 plans22.
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 here28 where the community is divided into groups ("channels") specific to language/ region.
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You can change the language for the entire community from Admin Panel> Settings> Language. It changes the language for the entire community, all the buttons, notification messages, ...
However, still you can use another languages keyboard to post your contents in any language. Just like Fb or Instagram.
We have "Translation" app that helps you translate all the posts form any other languages to English, which can help you understand your user's posts from any language.
I would recommend to create different "Groups' for each language. For example, create a group for "German", where all users are posting contents in German. That can be the place for your German users.
However, we have the multilingual community available though the extra instances, which is an option for our Premium and Enterprise clients only. You can learn more about it here115.