Fixes #5037 You can now configure periods that are available in the UI and API

; The list of periods that are available in the Piwik calendar
; Example use case: custom date range requests are processed in real time,
; so they may take a few minutes on very high traffic website: you may remove "range" below to disable this period
enabled_periods_UI = "day,week,month,year,range"
enabled_periods_API = "day,week,month,year,range"