How to build a JrElastic multilingual-based site using the Site Builder?
Using Jamroom
Creating a multi lingual site is a little bit more involved than just clicking buttons - mainly because you need to tell Jamroom WHAT language strings need to go where.
For existing templates used in Site Builder (say creating an audio list) then YES - those templates are setup to be multilingual. That does NOT mean the language you want to use is supported - support for languages other than en-US has to be ADDED to Jamroom. You can do this via the "Clone a Language" option in the ACP -> Users -> User Accounts -> Tools section.
Once that is done, the you would do like Douglas has outlined and use the {jrCore_lang} function in your custom templates to tell JR what lang string to place there.
Let us know if that helps.