In that region it will be German and French. Luxemburg is not Dutch but Luxemburgish which is a German dialect, but also French.
Bavarian dialect is spoken in the South and it is similar to Austrian dialect.
Some dialects in the area of Trier and Saarbrücken are difficult to understand but many people will speak a little English- although not so much on the French Border.
You may look for Berlitz product which in the US is sold by www.americanmap.com