Show to the user which attributes of an object are required

[ICHydro]

Is your feature request related to a problem or limitation? Please describe.
It is not clear to the user what attributes of an object are required when creating a new object. For example, a station needs a timezone, but does not need a region for the object to be created.

Describe the solution you'd like
Make clear which entries are required, for example with a red asterisk