CSS "nowrap" for help dialogue

[tordans]

When you view the help dialogue in German, the keyboard shortcuts have linebreaks. This makes the view less nice a harder to read and understand.

Testcase: https://www.openstreetmap.org/edit?locale=de

Possible fix: Add white-space: nowrap; to the .modal-shortcuts .shortcut-keys.

See screenshot before / after.

[manfredbrandl]

@tordans I shortend the explanations: "Festhalten verhindert Vereinigen beim Platzieren", "Trenne den Knoten von seinen Linien/Flächen", "Ecken eines Weges/einer Fläche rechtwinklig machen". Looks good:

[bhousel]

Thanks @manfredbrandl that looks much better 👍
I do agree with @tordans that we should nowrap the shortcut keys.

[quincylvania]

Done in 0c29054. I also made this UI responsive so the two columns wrap to one on smaller displays.