There are two ways of how the currency can be displayed next to any amount in Offer Templates. It's either the currency symbol or the currency code (3-letter abbreviation).
Below is some sample code that models how to change the code EUR to the symbol €. So instead of 10 EUR, the price will now show 10 €.
term.firstRealPrice.replace(‘EUR’, ‘’).replace(‘.’, ‘’).replace(‘,’, ‘’).replace(‘€’, ‘’).replace(' ‘, ‘’).slice(0, term.firstRealPrice.replace(‘EUR’,‘’).replace(‘.’,‘’).replace(‘,’, ‘’).replace(‘€’, ‘’).replace(' ‘, ‘’).length - 2 )