Translations - adding language versions to projects
Translations feature allows for displaying your project page in more than one default language. It will inform backers about that possibility and adjust language version depending on platform's language version chosen by backer:

To enable additional language versions, go to Project settings -> Translations.

You'll see a list of all available languages:

Click the pencil icon to enable the language and change language visibility - if you want to input content in certain language version, enable it first. Once you're done, publish it by changing the visibility to true.
Every reward, add-on, and project details (about and detailed description) will now have an extra language option at the top, which you can change to input contents in various languages. It also applies to updates and FAQs.
NOTE: Content in other languages need to be translated and added by creator.

Change the language to edit the reward/add-on/project description. The system will automatically display the sections you can edit in the selected language. You can make changes to other product/add-on settings (price or published status, etc.) only in the default language.
NOTE: If you enable a language and make it visible but you haven't added any content in the other language version, the system will show the default content (English).