Feature/i18n react i18next

.env.template

@@ -9,6 +9,24 @@
 
 DISABLE_DISPLAY_KEYS=false # if true, API keys will not be shown in the frontend
 SANDBOX=local              # code execution backend: 'local' (default) or 'docker'
+# LOG_LEVEL=INFO           # logging level for data_formulator modules (DEBUG, INFO, WARNING, ERROR)
+
+# Data directory — where workspaces and sessions are stored on disk.
+# Useful for server deployments with large datasets or dedicated storage volumes.
+# Resolution order: --data-dir CLI flag > DATA_FORMULATOR_HOME env var > ~/.data_formulator
+# Directory structure:
+#   DATA_FORMULATOR_HOME/
+#   ├── workspaces/   (user data: parquet, uploads, metadata)
+#   └── sessions/     (saved sessions)
+# DATA_FORMULATOR_HOME=
+
+# Available UI languages (optional, comma-separated).
+# Default: en,zh — if not set, both English and Chinese are available.
+# Supported values: en, zh  (add more after creating locale files)
+# Examples:
+#   AVAILABLE_LANGUAGES=zh          # only Chinese, language switcher hidden
+#   AVAILABLE_LANGUAGES=en,zh,ja    # three languages
+# AVAILABLE_LANGUAGES=
 
 # -------------------------------------------------------------------
 # LLM provider API keys

.gitignore

@@ -336,6 +336,7 @@ paket-files/
 # Python Tools for Visual Studio (PTVS)
 __pycache__/
 *.pyc
+*.egg-info/
 
 # Cake - Uncomment if you are using it
 # tools/**
@@ -408,6 +409,8 @@ FodyWeavers.xsd
 *.sln.iml
 venv
 
+# Temporary documentation directory
+tmp-docs/
 
 \.\NUL
 NUL

Dockerfile

@@ -35,6 +35,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # Create a non-root user to run the application
 RUN useradd -m -s /bin/bash appuser
 
+# Ensure Unicode filenames work correctly (Chinese, Japanese, etc.)
+ENV LANG=C.UTF-8
+
 # Set the home directory for workspace data to a deterministic path
 ENV DATA_FORMULATOR_HOME=/home/appuser/.data_formulator