Add language tag

Hi
A PR to improve the referencing of your dataset 🤗

README.md

@@ -1,10 +1,12 @@
 ---
 license: etalab-2.0
 configs:
-  - config_name: compact
-    data_files: "data/datagouvfr-datasets.csv"
-  - config_name: raw
-    data_files: "data/datagouvfr-datasets-raw.csv"
+- config_name: compact
+  data_files: data/datagouvfr-datasets.csv
+- config_name: raw
+  data_files: data/datagouvfr-datasets-raw.csv
+language:
+- fr
 ---
 
 # datagouvfr-datasets
@@ -26,4 +28,4 @@ This config exposes 3 features:
 
 ## raw
 
-All columns from the original catalog, with the preprocess filter described above. Description is still in markdown.
+All columns from the original catalog, with the preprocess filter described above. Description is still in markdown.