fix multilang config

voxpopuli.py

@@ -60,20 +60,20 @@ _METADATA_PATH = _BASE_DATA_DIR + "{lang}/asr_{split}.tsv"
 class VoxpopuliConfig(datasets.BuilderConfig):
     """BuilderConfig for VoxPopuli."""
 
-    def __init__(self, name, languages=None, **kwargs):
+    def __init__(self, name, languages="all", **kwargs):
         """
         Args:
           name: `string` or `List[string]`:
-            name of a config: either one of the supported languages, "all" for all languages (including accented English),
-            or "multilang" for a specific set of languages which must be specified in the `languages` parameter.
-          languages: `List[string]`: custom list of languages for downloading (if config is "multilang")
+            name of a config: either one of the supported languages, "multilang" for many languages.
+            By default, "multilang" config includes all languages, including accented ones.
+            To specify a custom set of languages, provide them to the `language` parameter
+          languages: `List[string]`: if config is "multilang" can be either "all" for all available languages,
+            including accented ones (default), or a custom list of languages.
           **kwargs: keyword arguments forwarded to super.
         """
-        if name == "all":
-            self.languages = _LANGUAGES
-        elif name == "multilang" and languages:
-            self.languages = [languages]
-            name = "+".join(languages)
+        if name == "multilang":
+            self.languages = _LANGUAGES if languages == "all" else languages
+            name = "multilang" if languages == "all" else "_".join(languages)
         else:
             self.languages = [name]
 
@@ -89,7 +89,7 @@ class Voxpopuli(datasets.GeneratorBasedBuilder):
             name=name,
             version=datasets.Version("1.3.0"),
             )
-        for name in _LANGUAGES + ["all", "multilang"]
+        for name in _LANGUAGES + ["multilang"]
     ]
     DEFAULT_WRITER_BATCH_SIZE = 256