Chart cannot display profit larger than 1000

The dashboard chart does not display profit correctly if value is larger than 1000 as Highchart does not handle the thousand separator correctly. Example:

Profit value = 1200.00
With LOCALE en_US thousand separator is ","
This makes the chart value 1,200.00

The chart will show 1 and not 1,200.00 as it breaks the value after the ",".