update ExampleApp add view to change language

ExampleApp/Extra/lang/en.yaml

 hello_message: 'Hello extra page!'
-men_index: 'Extra page'
+men_index: 'Extra page'
\ No newline at end of file

ExampleApp/Main/__init__.py

-from flask import render_template
+from flask import render_template, session, request
 
 def home():
-  return render_template('home.html')
+  print(session.get('language'))
\ No newline at end of file
+  return render_template('home.html')
+
+def change_lang():
+  session['language'] = request.args.get('lang')
+  print('session language: {0}, request lang {1}'.format(
+    session['language'], request.args.get('lang')) )
+  return render_template('change_language.html')
\ No newline at end of file

ExampleApp/Main/lang/de.yaml

 hello_message: 'Hallo Startseite!'
 men_index: 'Startseite'
-men_index_repo_link: 'Gitlab Repo'
+men_index_repo_link: 'Gitlab Repo'
\ No newline at end of file
+change_lang_german: 'Deutsch'
+change_lang_english: 'Englisch'
+men_change_lang: 'Sprache ändern'
\ No newline at end of file

ExampleApp/Main/lang/en.yaml

+hello_message: 'Hello Home!'
+men_index: 'Home'
+men_index_repo_link: 'Gitlab Repo'
+change_lang_german: 'German'
+change_lang_english: 'English'
+men_change_lang: 'Change language'
\ No newline at end of file

ExampleApp/Main/manifest.yaml

@@ -2,7 +2,11 @@ default_language: 'de'
 views:
   - url: &index_url ''
     function: 'home'
+  - url: &change_lang_url 'change-lang'
+    function: 'change_lang'
 menu:
+  - url: *change_lang_url
+    name_string: 'men_change_lang'
   - url: *index_url
     name_string: men_index
     menu:

ExampleApp/Main/templates/change_language.html

+{% extends "base-struct.html" %}
+{% block title %}Index{% endblock %}
+{% block head %} {{ super() }} {% endblock %}
+{% block content %}
+    <h1>{{ app_lang['change_lang_title'] }}</h1>
+    <a href='/change-lang?lang=en'>{{ app_lang['change_lang_english'] }}</a>
+    <a href='/change-lang?lang=de'>{{ app_lang['change_lang_german'] }}</a>
+{% endblock %}
+{% block header %}samsHUB -{% endblock %}
\ No newline at end of file