Indeed the data is incomplete yet. Bear in mind that the data comes from a specific use on https://www.capitainetrain.com That is why many countries are poorly covered (yet! we plan to eventually cover whole Europe).
There is no magic to find the UIC code, sorry… Sometimes it is in OpenStreetMap, sometimes we get it from a rail operator… But it is not a required value, so you can add it with out the station.
`is_suggestable` means that the user can input the station on capitainetrain.com. Leave it false for now ;)
The idea behind the name vs. info is that name is the station as it is locally known. Info adds any information extra information to help to find which station it is (that includes translations, “Central Station” for people not understanding „Hbf“, disambiguation between similar names…)