How to change related products h2 in Electro theme product page?

[DaySmilEe]

Hello,

Could someone help me change the name of the related products and the headings "We also recommend" and "Related Products" from h2 to h3 on the product page of the Electro theme?

For example: https://www.cerraduraplus.es/bombin-cerradura-seguridad-abus-bravus-mx-pro-magnet/

THANK YOU VERY MUCH!