Whenever a link points to a document available for download in a different language than the main language of the page, then the language of the document must be indicated in the link text.
Note
If it is not practical to add this information in the link texts (lack of space in the mock-up, for example), there are other solutions that can be used later in the development phase (adding tooltips, for example). Nevertheless, this is a compromise solution that is less effective than directly optimizing the link text.