Change Sale Badge to % off
In card-product.liquid

{% comment %} {{- 'products.product.on_sale' | t -}} {% endcomment %}

{%- assign percent = card_product.compare_at_price | minus: card_product.price | times: 100 | divided_by: card_product.compare_at_price | round -%}
Save {{ percent }}%
</span>
In price.liquid
Change to:

{%- if show_badges -%}
<span class="badge price__badge-sale color-{{ settings.sale_badge_color_scheme }}">
{% comment %} {{ 'products.product.on_sale' | t }} {% endcomment %}
{%- assign percent = product.compare_at_price | minus:product.price | times: 100 | divided_by:product.compare_at_price | round -%}
Save {{ percent }}%
</span>