Write the full App Store listing for a new locale — name, subtitle, keyword field and description — from…

Write the full App Store listing for a new locale — name, subtitle, keyword field and description — from the app's source listing, with every keyword measured in that storefront first. The first call starts the write and answers pending (it takes one listing write from the workspace's allowance; get_usage shows what is left); call again with poll=true until the listing comes back. With shots=true the screenshot captions come back in the same language too. Needs get_storefront_audit to have run for the app. Writes nothing to App Store Connect; update_listing does that.