Bug972573, The selection screen for adding a contact with multiple phone...

... numbers to a SMS message lacks a cancel, back, or 'x' button

It correspondence of reviews.
https://github.com/mozilla-b2g/gaia/pull/20051

https://bugzilla.mozilla.org/show_bug.cgi?id=972573
It is my understanding that you say add new line in locales file, and use it.
Like this:
・activities.js
              prompt1.addToList(
              _('Destination', {destination: itemData, carrier: carrier}),
              capture(itemData)
            );
・contacts.en-US.properties
  Destination = {{ destination }} {{ carrier }}

Is it correct?
If it was my misunderstanding, please more detail.