Change the first day of the week in my calendar

First day of the week (as a calendar view) should be able to set on account settings (My Profile > Preferences). Not by Admin of the organization only since some people may want to have Sunday (or Monday) as First day of the week in calendar view.
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Additional Note: I see this as a cultural preference. Some may prefer Sunday as first day of the week in calendar and some may prefer Monday. Like date and time format preferences, First day of the week should be able to configure as well.