Bug 33028: (follow-up) Rewrite database update

Bug 33028: (follow-up) Rewrite database update

This rewrite the database update with some things in mind:

* We now use a positive value list of allowed characters to check
  This makes sure that all of those are recognized:
  1,00
  1.00€
  abc
* Instead of dying after finding one wrong value, we loop through
  all values first, building up an error string
* When we have errors... we die and print the full list of things
  that need fixing.

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>