Export to Excel should support different number separators as defined in system settings 4.9

The customer would like the ability to export numeric values to excel in a format that conforms with Swedish numeric format. In Clarizen, we can change the system setting 4.9 Number separator to reflect the Swedish numeric format with a comma, but when numeric values are exported to Excel, they are exported with a dot separator instead of comma. For future reference, the feature request ID is CR-529759.