unify language codes

src/seamless_communication/assets/cards/unity_nllb-100.yaml

@@ -104,5 +104,5 @@ langs:
   - vie
   - yor
   - yue
-  - zlm
+  - zsm
   - zul

src/seamless_communication/assets/cards/unity_nllb-200.yaml

@@ -208,5 +208,5 @@ langs:
   - yor
   - yue
   - cmn
-  - zho_Hant
+  - cmn_Hant
   - zul