##### A — NO SESSION: the visitor's own language
  settings.json language before: "language": "hu"
  /login with no cookie      -> html lang=<html lang="hu"
  globe present on /login    -> 1
  POST /lang lang=en back=/login -> 303 felhom_lang	en
  /login WITH the cookie     -> html lang=<html lang="en"
  and an English phrase      -> 1
  settings.json language after:  "language": "hu"
  POST /lang lang=xx         -> 400
  POST /lang back=//evil     -> /
  /claim and /recovery globes: /claim=1 /recovery=0 
##### B — WITH A SESSION: the household's own setting, cookie NOT read
  /launcher with session + the en cookie -> html lang=<html lang="hu"
  the footer: version, globe, sign-out in order -> 
  the OLD text links are gone -> lang-switch-btn count = 0
##### C — the saved notes, as they stand on this box
"last_warning": "A belső SSD-n csak a konfiguráció, adatbázis és a kötelező adatok férnek
