Ability to set a display value for a tax code

Tax code is unique, so there is no way to make it the same for two taxes.

Acceptance

• Ability to set display value for tax code:
  • code; tax rate; displayValue;
  • VAT9; 9; VAT;
  • VAT21; 21; VAT;
• Customers would see: inc 9% VAT instead of inc 9% VAT9
• Customers would see: inc 21% VAT instead of inc 21% VAT21