View source for Language Metadata

===Purpose of additional language metadata===
In order to group/select section/category descriptions, module content or menu names based on their language an additional reference to the language is useful. This meta information will the improve the possibilities of extensions to sort out language specific content. E.g. a RSS feed extension can present information for different languages or a content list can present the number of articles in one specific language without complex and time intensive database queries over a 'text' type filed.