Expanding the WMT24++ Benchmark with Rumantsch Grischun, Sursilvan, Sutsilvan, Surmiran, Puter, and Vallader. - Jannis Vamvas; Ignacio Pérez Prat; Not Battesta Soliva; Sandra Baltermia-Guetg; Andrina Beeli; Simona Beeli; Madlaina Capeder; Laura Decurtins; Gian Peder Gregori; Flavia Hobi; Gabriela Holderegger; Arina Lazzarini; et al. (CoRR, 2025)