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

app/.dockerignore

@@ -2,4 +2,6 @@ tests/
 **/__pycache__
 *.pyc
 .DS_Store
-build.sh
+build.sh
+*.pot
+*.po