Mention what happens if the user pushes space in the search bar / term input

[nilmerg]

While the input is empty. The placeholder should describe this.

[flourish86]

I'd rather use the placeholder to indicate what the user can search for. see #248

Plus rather make the suggestions appear on focus. This is what we observed the users expecting in the scheduler usability tests.

[nilmerg]

Doing something just because a user expects it…

Just imagine how this feels for keyboard users, i.e. those using TAB to cycle through inputs. I hate what the director does with the element descriptions. If we show suggestions right on focus, this is even worse as the suggestions catch TAB then. So maybe we could do this only if a mouse click happened, but I don't quite know what I think of that either.

The placeholder is maybe not the best option, but then let's think about something else. Please.