Maintenance release 2.3.5

This is a small maintenance release, not a big deal. 

2.3.5: Maintenance release "Fleurie"

- feature:

• none

- bugfix:

• cannot attach image to storage from download folder (in rare cases)

- enhancement:

• none

- changed:

• increase maximum value for sugar (now: 400g/l)

Have fun end enjoy!