Verify if these API files are still valid and up-to-date

[christian-weiss]

bochum => #21
brueggen => #22
duisburg => #22
essen => #23
kleve => #22
luenen => #25
menden => #26
moenchengladbach => #22
moers => #22
nettetal => #22
raesfeld => already updated
schwerte => #25
viersen => #22
voerde => #24
warendorf => #11
wesel => see #24
willich => #22
xanten => #24

[christian-weiss]

All work will be done in linked issues. Closing this issue here now.