S allius/issue385 (#386)

* ignore translation and log files

* add quart-babel

* build and install translation files

* don't export the web-ui port 8127

- for security reason the user should use the
  HA ingress and not the direkt access to the web
  dashboard

* set 'lang' in html tag

.gitignore

@@ -13,3 +13,7 @@ Doku/**
 .env
 .venv
 coverage.xml
+*.pot
+*.mo
+*.log
+*.log.*