[REF] web_editor: review left-panel datetimepicker

While it was working perfectly in normal flows, some elements would not
have worked correctly if the datetimepicker was used another way. This
was revealed while working on another task.

This commit also fixes some issues:

- The datepicker was not working in languages where the date format is
  different that the english one (the date was displayed correctly but
  interpreted as if it was using the english formatting).

- Because of summernote, the datepicker sometimes loses the focus and
  get it back directly... but this is enough for it to close. Now, we
  open the datepicker on focus, not on click, so that summernote only
  make it close then reopen right away (not possible to notice).

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