Merge branch 'release/7.x-0.8.3' into develop
fix js error with check_availability
scrumdo#737: no default values if a new pickup library is selected
scrumdo#737: fixed typo
scrumdo#752: fill userdata in reservation if a favorite library. Empty otherwise.
Tagging version 7.x-0.9.
Merge branch 'release/7.x-0.9'