* add optional java script to fetch data regullary
* change file extension to `html.j2` for templates
* fix route for fetch data
- for running in iframes (e.g. HA ingress) we must
use relative path in the URLs
* increase test coverage
* remove unused statements
* 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
