v2.5.2

Changed

• Demo start page in German, English and Spanish. The demo gateway now speaks the visitor's
  language on every page it renders: start page, session ended, expired, maintenance, capacity
  and rate-limit notices. A flag menu (Germany, United Kingdom, Spain) switches the language
  with mouse or keyboard. The language is picked from an explicit ?lang= link parameter
  (the website passes its current language), then the stored demo choice, then the browser
  language, then English. The chosen language is carried into the demo session, so the app
  opens in it, and an explicit language change inside the demo is kept across logout, restart
  and expiry.

Fixed

• The demo start page was always German for visitors whose browser or website language was not
  German, because the website language never reached the demo host.