Password reset

We should allow password resets (also for backends like LDAP)

added Security part::backend part::frontend prio::1 type::feature workflow::confirmed labels

mentioned in merge request Teckids/ticdesk!55

assigned to @debdolph

mentioned in merge request !475 (merged)

mentioned in merge request !478 (merged)

Done in !413 (merged)

mentioned in merge request !413 (merged)

added 1 deleted label

added board::todo label and removed 1 deleted label

added board::ready label and removed board::todo label

closed with merge request !413 (merged)

mentioned in commit 6ca32fa3