old_contents: from flask import Flask
  from flask_sqlalchemy import SQLAlchemy
  from db import tables as dbTables
  
  app = Flask(__name__, template_folder='./web/templates/')
  app.config['SECRET_KEY'] = 'some_secret_key'
  app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://user:password@localhost/csan'
  db_connection = SQLAlchemy(app)
  
  import web.admin
  import web.views
new_contents: from flask import Flask, request, session
  from flask_sqlalchemy import SQLAlchemy
  from flask.ext.babelex import Babel
  from db import tables as dbTables
  
  app = Flask(__name__, template_folder='./web/templates/', static_folder='./web/static/', static_url_path='')
  app.config['SECRET_KEY'] = 'some_secret_key'
  app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://user:password@localhost/csan'
  db_connection = SQLAlchemy(app)
  
  # Initialize babel
  babel = Babel(app)
  @babel.localeselector
  def get_locale():
      override = request.args.get('lang')
      if override:
          session['lang'] = override
      return session.get('lang', 'ru')
  
  import web.admin
  import web.views
subject: Add babel plugin for Flask