HOTFIX: thumbnail placeholder invalid for type "Institution" instead of
"institution"
HOTIFX: added logging for mail configuration
HOTFIX: added configurationservice entry for apikey
HOTFIX: Added handling for new placeholder type "sonstiges" and fixed
wording problem in confirmation mail.
HOTFIX: increased session timeout to 60min
HOTFIX: changed default sender email address to noreply
Merged back the hotfixed from the release/4.1 branch to develop