Use fallback for bike sharing popup when name is empty

[leonardehrenfried]

When running with the following config:

 CONFIG=landstadtmobil API_URL=https://api.dev.stadtnavi.eu yarn run dev

you can see that the rental bikes (actually scooters) popups are empty:

This is because DT assumes that these are stations that have a name. These individual scooters have no names.

Acceptance criteria

When name is empty or empty string, then use the translation key {network}-station-no-id, which in the TIER Reutlingen case is just "TIER E-Scooter".