fix: dynamic bert/language mapping

docker/.env.example

@@ -48,6 +48,12 @@ TFLC_REPO_ID=Hexastack/tflc
 INTENT_CLASSIFIER_REPO_ID=Hexastack/intent-classifier
 SLOT_FILLER_REPO_ID=Hexastack/slot-filler
 NLU_ENGINE_PORT=5000
+BERT_MODEL_BY_LANGUAGE_JSON='{
+    "en": "bert-base-cased",
+    "fr": "dbmdz/bert-base-french-europeana-cased"
+}'
+# Huggingface Access token to download private models for NLU inference
+HF_AUTH_TOKEN=
 
 # Frontend (Next.js)
 APP_FRONTEND_PORT=8080
@@ -65,5 +71,3 @@ REDIS_ENABLED=false
 REDIS_HOST=redis
 REDIS_PORT=6379
 
-# Huggingface Access token
-HF_AUTH_TOKEN=