Change the labels of 'address 1/2' into 'address line 1/2' to avoid confusion

I am bringing this up, because in the Netherlands a secondary address line is very uncommon, and it is causing confusion for some visitors of my site. Most local e-commerce sites only use one address line, the few that offer a secondary line have named it "Address line 2".
This module names it "Address 2", which is confusing especially if you are not used to it. People tend to interpret it as a secondary address, not a second line for one address. For this reason I'd like to ask if the field labels can be changed accordingly. I believe adding the word 'line' only adds information and should not have any impact on existing sites.

I've found this article about formatting address line 2: http://baymard.com/blog/address-line-2. It comes with some great 'in the wild' examples to enhance usability.