say: one count rule everywhere, and a page she can explain (V-521)

The PR 113 review found four defects in one line file. Swept the other four
families and the Go side for the same four.

The JSON was clean: no undeclared placeholder, no abbreviation spoken, no
single-variant entry left unfixed. One register leak — page_blocked read
"robots.txt" out loud, which is a filename, not a reason he can act on.

The count rule was not clean. Four more copies of the three-way agreement
existed and two of them were wrong: ruPlural produced «1 минут назад» and
«5 часа назад» because formatTime spelled the noun out. pluralTasksRU was a
fifth copy. All of them now call say.CountWord. The pending-notification
summary picks the whole phrase, because the adjective declines with the noun.

internal/tasks/rank_test.go

@@ -4,6 +4,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/kami/maven/internal/say"
 )
 
 func at(y int, m time.Month, d int) *time.Time {
@@ -240,8 +242,8 @@ func TestFormatRUTailCarriesTheNoun(t *testing.T) {
 		t.Errorf("reply = %q, want the count with its noun", got)
 	}
 	for n, want := range map[int]string{1: "задача", 2: "задачи", 5: "задач", 11: "задач", 21: "задача"} {
-		if got := pluralTasksRU(n); got != want {
-			t.Errorf("pluralTasksRU(%d) = %q, want %q", n, got, want)
+		if got := say.CountWord(n, "задача", "задачи", "задач"); got != want {
+			t.Errorf("CountWord(%d) = %q, want %q", n, got, want)
 		}
 	}
 }