Replace wmt18 main branch with main-zip

wmt_utils.py

@@ -439,7 +439,7 @@ _TRAIN_SUBSETS = [
         name=ss,
         target="en",
         sources={"zh"},
-        url="https://huggingface.co/datasets/wmt/wmt18/resolve/main/cwmt-wmt/%s.zip" % ss,
+        url="https://huggingface.co/datasets/wmt/wmt18/resolve/main-zip/cwmt-wmt/%s.zip" % ss,
         path=("%s/*_c[hn].txt" % ss, "%s/*_en.txt" % ss),
     )
     for ss in CWMT_SUBSET_NAMES