Update duckdb index files

.gitattributes

@@ -41,3 +41,4 @@ data/2017-01-trnted/texts/en/ko/en-ko.tgz filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ar-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ar-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ar-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-de-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-de-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2a1cbc62af6b93e22d30a8c3abf49479ecb3c8aaaa9dd4e05a06bd9cd9217609
+size 22818816