Kathmandu: Director General of UNESCO, Koichiro Matsuura, on Tuesday appealed to concerned to move for the cause of languages and appreciate theirdiversity. He said this in a message issued to mark the International Mother Language Day today. The proclamation by the African Union to declare 2006 as Year of African Languages and the meetings held during and between the two phases of the World Summit on the Information Society are important in this context, statement said.