add quart-babel

app/requirements.txt

@@ -2,3 +2,4 @@
     schema==0.7.7
     aiocron==2.1
     quart==0.20
+    quart-babel==1.0.7

app/src/.babel.cfg

@@ -0,0 +1,2 @@
+[python: **.py]
+[jinja2: web/templates/**.html]

app/src/server.py

@@ -4,7 +4,8 @@ import logging.handlers
 import os
 import argparse
 from asyncio import StreamReader, StreamWriter
-from quart import Quart, Response
+from quart import Quart, Response, request
+from quart_babel import Babel
 from logging import config  # noqa F401
 from proxy import Proxy
 from inverter_ifc import InverterIfc
@@ -31,9 +32,20 @@ class ProxyState:
         ProxyState._is_up = value
 
 
+def get_locale():
+    # hass.selectedLanguage
+    logging.info("get_locale(%s)", request.accept_languages)
+    return request.accept_languages.best_match(
+        ['de', 'en']
+    )
+
+
 app = Quart(__name__,
             template_folder='web/templates',
             static_folder='web/static')
+babel = Babel(app,
+              locale_selector=get_locale,
+              default_translation_directories='../translations')
 app.register_blueprint(web_routes)
 
 

app/src/web/templates/index.html

@@ -2,7 +2,7 @@
 
 {% block title %} TSUN Proxy - Dashboard {% endblock title%}
 {% block menu1_class %}w3-blue{% endblock %}
-{% block headline %}<i class="fa fa-dashboard"></i> My Dashboard{% endblock headline %}
+{% block headline %}<i class="fa fa-dashboard"></i> {{_('My Dashboard')}}{% endblock headline %}
 
 {% block content %}
   <div class="w3-row-padding w3-margin-bottom">

app/translations/de/LC_MESSAGES/messages.po

@@ -0,0 +1,25 @@
+# German translations for tsun-gen3-proxy.
+# Copyright (C) 2025 ORGANIZATION
+# This file is distributed under the same license as the tsun-gen3-proxy
+# project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2025.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: tsun-gen3-proxy 0.14.0\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2025-04-18 20:46+0200\n"
+"PO-Revision-Date: 2025-04-18 16:24+0200\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: de\n"
+"Language-Team: de <LL@li.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.17.0\n"
+
+#: src/web/templates/index.html:5
+msgid "My Dashboard"
+msgstr "Mein Dashboard"
+