message: web: Change create merchant language
diff: <ActionCardContainer
  - @header="Merchant Customization"
  + @header="Merchant Account"
  @isComplete={{@isComplete}}
  data-test-layout-customization-is-complete={{@isComplete}}
  >
  - <ActionCardContainer::Section @title="Choose a name for the merchant" />
  + <ActionCardContainer::Section @title="Choose a name and ID for the merchant" />
  <Boxel::ActionChin
  @state={{if @isComplete "memorialized" "default"}}
  data-test-layout-customization
  