Related Products

Hi, this is my first post so be gentle with me

I am migrating from Actinic because I find it sooooo cumbersome and I love opencart so far.

How do I change the 'Related Products' title so that it says something different in the shop - 'Flue Options' in my particular case.

TIA.

PS I think this smilie is excellent

catalog/language/english/product/product.php - Frontend
admin/language/english/catalog/product.php - Backend

Thank you!