{{/* abono-plan-card — one plan at one interval: its name, the price
     that is sold for it, and a button to buy.

     A plan with nothing sold at Interval says so ("abono.plan.interval_unavailable")
     and offers no button, rather than quietly selling another interval.
     Prices that are no longer sold (legacy prices) are never shown, nor
     is a price billed other than every month or every year
     (Price.Unsupported).

     Keys:
       Offer     abono.Offer, required
       Interval  string, optional — "month" or "year". Empty shows every
                 sold price, which is right for a plan with just one; with
                 several the button cannot choose between them, so name one.
       Action    string, required — where the buy form posts
       Code      bool, optional — a promotion code field in the buy form
       L         *ui.Localizer */}}
{{define "abono-plan-card"}}{{$L := localizer $}}{{$iv := or (opt . "Interval") ""}}{{$found := false}}<div rst-box><h3>{{or .Offer.Name .Offer.Plan}}</h3>{{range .Offer.Prices}}{{if and .Sold (not .Unsupported) (or (eq $iv "") (eq .Interval $iv))}}{{$found = true}}{{if .Currency}}<p>{{template "abono-price" dict "L" $L "Price" .}}</p>{{end}}{{end}}{{end}}{{if $found}}{{template "abono-subscribe-button" dict "L" $L "Action" .Action "Plan" .Offer.Plan "Interval" $iv "Code" (opt . "Code")}}{{else}}<p>{{T $L "abono.plan.interval_unavailable"}}</p>{{end}}</div>{{end}}