Looking around today I note that certain Site text strings are only found in the Admin language ini file.

I needed to change J2STORE_CHECKOUT_SHIPPING_PAYMENT_METHOD which shows in the front end but its defined in the Admin ini file.

Similarly, J2STORE_VIEW_ORDER_HISTORY is not in Site, but is in Admin.

This is confusing (at least to me) as I had to create overrides in the Site ini file to deal with me needing to have different text for - at least these two - strings.

Can the Site strings be moved or added to the Site ini file?

So the recommendation would be to use the System Language Override?

I can find the constant and its value in the extension's language file and once found I can create the override in the System level area?