LANGUAGE LAW AND LEGAL CHALLENGES IN MEDIUM-SIZED LANGUAGE COMMUNITIES. A COMPARATIVE PERSPECTIVE (WOEHRLING, JOSÉ / BRAËN, ANDRÉ / MILIAN-MASSANA (ED.), ANTONI / ARZOZ SANTISTEBAN, XABIER / HOFMANNOVÁ, MAHULENA / NIC SHUIBHNE, NIAMH / RANNUT, MART / ULASIUK, IRYNA / URRUTIA LIBARONA, IÑIGO)