Right now video titles and descriptions can only be done in 12 languages; album titles and descriptions are only in English; and there's no way to specify the language in a blog post.

It would be nice to be able to publish any content in any language (including regional and constructed languages) by having a customisable language tag. It would also be nice to be able to upload subtitles on videos (in a separate file) and allow community subtitles (like Youtube used to do).