Calendar 1.5.1

Nextcloud calendar 1.5.1

Added

• advanced color-picker
  #4
• support for Internet Explorer 11
  #329
• added second step for deleting calendars
  #341

Fixed

• debounce vertical window resize
  #23
• fix phrasing on public sharing site
  #233
• fix missing am/pm label in timepicker
  #345