Change "Tax included" text on product page

[dragon_sa]

I am trying to simple change the text "Tax included" listed under the product price to "includes GST"

I have changed the text in the back end under Translations/other translations/english, as this seems to be the only place it is listed, then cleared the cache in the backend and in my browser and it still shows "Tax included" and not my required text.

I am using version 1.7.6.5, does anyone know how to do this, would be much appreciated, as all my searches seem to bring up this option or how to remove it.

Edited June 20, 2020 by dragon_sa
couldnt see pictures clearly (see edit history)