[application] hides submit-button for application until application is completed,
displays an 'incomplete' message while needed data is missing

(#5569)
Merge branch 'tmp3' into tmp2
Merge branch 'hotfix/0.16.2'
Merge branch 'master' into tmp2
[Organizations] delete File OrganizationContactInterface (not used)
[Application] fixes error in autocomplete search form

(#5589)
Merge branch 'hotfix/0.16.3' into develop