Linguistic map of Europe as of today. Striped areas indicate several mother tongues in the region. For example, Brussels is a majority-French city, shown striped French and Dutch because of the Dutch minority residing there.
Edit on January 5th (I followed some of your suggestions)
-Added German minority in Silesia
-Added Italian (Corsican) on Corsica
-Added English in Malta
-Grouped Ladin and Friulan together
-Changed the colour of Greek to better distinguish it from Arabic
-Increased the size from 2300x2000 to 2800x2400