Update duckdb index files

.gitattributes

@@ -59,3 +59,4 @@ bg-sv/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-de/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-da/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs-el/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:870ecf8fd1b362c96acdddc4ec819711bebcc6d52711ee5f0c51c39959bcf3a0
+size 41431040