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import streamlit as st
import json
from pathlib import Path
import os
# Set path to locales directory.
LOCALE_DIR = Path(__file__).parent.parent / "locales"
def load_language(lang_code):
# Load all JSON language files for a given language.
lang_dir = LOCALE_DIR / lang_code
translations = {}
if lang_dir.is_dir():
for file_path in lang_dir.glob("*.json"):
with open(file_path, "r", encoding="utf-8") as f:
translations.update(json.load(f))
# Fallback to English if no translations are found.
if not translations:
en_dir = LOCALE_DIR / "en"
if en_dir.is_dir():
for file_path in en_dir.glob("*.json"):
with open(file_path, "r", encoding="utf-8") as f:
translations.update(json.load(f))
return translations
def initialize_localization():
# Set up the session state for localization.
if 'lang' not in st.session_state:
st.session_state.lang = "en"
if 'translations' not in st.session_state or st.session_state.get('lang_changed', False):
st.session_state.translations = load_language(st.session_state.lang)
st.session_state.lang_changed = False
def tr(key):
# Translate a key using the loaded language file.
return st.session_state.translations.get(key, key)
def language_selector():
# Show a dropdown to select the language.
languages = {"English": "en", "Deutsch": "de"}
display_to_code = {name: code for name, code in languages.items()}
code_to_display = {code: name for name, code in languages.items()}
def on_change():
selected_display_name = st.session_state.language_selector_key
st.session_state.lang = display_to_code[selected_display_name]
st.session_state.lang_changed = True
current_lang_code = st.session_state.get('lang', 'en')
try:
current_index = list(languages.keys()).index(code_to_display[current_lang_code])
except (KeyError, ValueError):
current_index = 0
st.selectbox(
label="Language",
options=list(languages.keys()),
key="language_selector_key",
on_change=on_change,
format_func=lambda lang_name: f"🌐 {lang_name}",
label_visibility="visible",
index=current_index
) |