Woocommerce languages

My woocommerce doesn’t seem to take notice of my translation file in wp-content/languages/woocommerce.

Maybe I’m approaching this on the wrong manner, but I have no idea how to resolve this.
In fact I’m not really translating, but I just want to have some terms changed, store-wide. (‘Cart’ should be ‘Quote request’ everywhere). So I thought; “My site is english (en_US). So if I create an en_US.po file, and change all the terms there, Woocommerce will pick it up.”
So I picked up the .pot file from wp-content/plugins/woocommerce/i18n/languages, renamed it to en_US.po and placed it in wp-content/languages/woocommerce. Then I opened it with Poedit and started changing. After I was done I saved it, an en_US.mo was created and I checked it. But no changes visible.

The only thing that I can think of is that the source base path in the PO file is wrong. This is set to ../../plugins/woocommerce
(from wp-content/languages/woocommerce to the woocommerce plugin) but to be perfectly honest, I have no idea.