How to insert currency manually in gravity forms php code?

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I have a problem with Gravity Forms plugin code. I’ve created whole form and I’ve set up currency to be “€”. The thing I want to accomplish is to have just different currency symbol on “Subtotal” part.
So all prices will be in “€” but last part where everything is calculated I just want to insert some other symbol eg. SUBTOTAL: $ 999 instead of SUBTOTAL: € 999

I found that gravityforms/includes/fields/class-gf-field-calculation.php is file that I have to edit, that is this part:

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return "<div class='ginput_container'>
                <input type='hidden' name='input_{$id}.1' value='{$product_name}' class='gform_hidden' />
                <span class='ginput_product_price_label'>" . apply_filters( "gform_product_price_{$form_id}", apply_filters( 'gform_product_price', __( 'Price', 'gravityforms' ), $form_id ), $form_id ) . ":</span> <span class='ginput_product_price' id='{$field_id}'>" . esc_html( GFCommon::to_money( $price, $currency ) ) . "</span>
                <input type='hidden' name='input_{$id}.2' id='ginput_base_price_{$form_id}_{$this->id}' class='gform_hidden' value='" . esc_attr( $price ) . "'/>
                {$quantity_field}
            </div>";
}

I can change ‘Price’ text but the problem is when I edit section after that: 

<span class='ginput_product_price' id='{$field_id}'>" . esc_html( GFCommon::to_money( $price, $currency ) ) . "</span>

Nothing happens when I edit $price and $currency. Can you tell me what am I doing wrong?

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