To add to this, it depends on the Java locale that is configured - by default Java picks up the locale of the operating system, and subsequently JIRA picks that up. If we take a look at http://docs.oracle.com/javase/8/docs/api/java/time/temporal/WeekFields.html, it shows us:
I haven't been able to find a definitive list of which locales are ISO-8601 - it appears Germany is one.
All you need to do is -
this.firstDayOfWeek = typeof firstDayOfWeek == "number" ? firstDayOfWeek : Calendar._FD; // 0 for Sunday, 1 for Monday, etc.
this.firstDayOfWeek = 1;
Restart your JIRA and check whether you can see the start date ofy of the week set to Monday. This worked for me!
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