Week number incorrect

[Torsteln Kongshem]

The timesheet table provides the incorrect weeknumber.

This week, November 28th - December 2nd is shown as "Week 49", but this is week 48

[Andriy Zhdanov]

Hi Torsteln,

Please see https://confluence.atlassian.com/jirakb/change-week-number-in-jira-s-calendar-802171323.html

Thank you.