We're evaluating the option to build community with community builder using custom lightning components. The main obstacle so far is the language support inside community builder.
Default language picker has only languages manually selected on site.com panel. The problem is there are only 18 main languages to choose from. Even if the user is already registered and his language is set as for example Polish, the community builder and all components inside are rendered in English (default), beause Polish is not on the list supported by this community.
Is it possible to somehow extend that list of languages on site.com? Release notes of Winter 14 state that it supports all 150 languages: http://docs.releasenotes.salesforce.com/en-us/winter14/release-notes/rn_186_sitecom_languages.htm