moment.js is updated to its latest maintained version.

Problems
Deprecation warning is shown when...

1. ...parsing dates in non ISO_8601 or RFC_2822 formats
2. ...using moment#locale

Solutions
Re 1: do not parse non ISO_8601 date formats
Re 2: use moment#updateLocale instead

AT
The following views / ui elements were refactored slightly in terms of date handling and should work like before:

• In Tasklist, ...
  • select a task and click on history
  • on form completion
    • with field of type date
    • if the value of a field of type date is not dirty
  • by searching for tasks
• In Cockpit, ...
  • the default search filter on history process instances table
  • on the cleanup page: 1) metrics; 2) we are in state "waiting for history batch window"
  • metrics on dashboard
  • process instances search on the batch operation page
  • any paginated list with search integration