fix locale handling in routing

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | [-
| License       | MIT
| Doc PR        | -

the locale listener was always removed, leading to routing being very confused and i.e. lunetics locale bundle always looking at browser or cookie and not at url.