In Other you can find sales promotion material not suited for any other folder. Such as Posters, Flyers, Press Releases etc.
Each document in Digital Library is tagged with a language. If you want to see a specific language select it in the dropdown menu on the left hand side and it will only show you documents in the selected language. This is only possible for documents and not images. If you perform a search with the filter active it will give you a notice that you have a filter active.