Update duckdb index files

.gitattributes

@@ -82,3 +82,4 @@ iwslt2017-en-ko/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-it-nl/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-nl/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-it-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-fr-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-fr-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0ace47e77bbf4a0caf7a96f44fde786595bc90d6872003e62784e79968ba3391
+size 26488832