We are in the process of identifying which languages are in use on a particular page so that these can be selected as a search filter. At present, we're working on identifying Dutch, Portuguese, English, Latin, Malay, Spanish, French, German, Italian, and Danish, since the characters used by these languages can be handled by our HTR software. But we know that other scripts and languages are also represented in the archives (e.g. Singhalese and Tamil). If you encounter examples of these, please let us know.