VolapÃ 1\/4 k is a constructed language created in 1880 by Johann Martin Schleyer . VolapÃ 1\/4 k ( pronounced , Ë vÉ ' lÉ pÊ k , also Volapuk ) is a constructed language , created in 1879 â `` 1880 by Johann Martin Schleyer , a Roman Catholic priest in Baden , Germany .