fix iwslt2017 processing to account for 6 missing language pairs

iwslt2017.py

@@ -68,9 +68,8 @@ class IWSLT2017Config(datasets.BuilderConfig):
         super().__init__(**kwargs)
 
 
-# XXX: Artificially removed DE from here, as it also exists within bilingual data
-MULTI_LANGUAGES = ["en", "it", "nl", "ro"]
-BI_LANGUAGES = ["ar", "de", "en", "fr", "ja", "ko", "zh"]
+MULTI_LANGUAGES = ["en", "de", "it", "nl", "ro"]
+BI_LANGUAGES = ["ar", "en", "fr", "ja", "ko", "zh"]
 MULTI_PAIRS = [f"{source}-{target}" for source in MULTI_LANGUAGES for target in MULTI_LANGUAGES if source != target]
 BI_PAIRS = [
     f"{source}-{target}"