add src_lang and tgt_lang columns

.gitignore

@@ -1,2 +1,2 @@
 .idea
-*/.DS_Store
+.DS_Store

data/subset=mdf_rus/split=dev/{part1.parquet → part_1.parquet}

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data/subset=mdf_rus/split=train/{part1.parquet → part_1.parquet}

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