Say it once, and say whose scores are hidden

A copy pass over the Finnish UI. The em-dash aside was doing the work of a
second sentence in ten places, so it is a second sentence now, or gone.

The sealed-score wording was wrong twice over: it promised "pisteet" when
only other people's are hidden, and said "kirjoitat" when the reveal
actually happens on save. Both fixed on the queue, the song page and the
card badge.

songs.go

@@ -295,7 +295,7 @@ func (a *app) editSong(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if affected(res) == 0 {
-		a.flash(w, "Kappaletta ei voi enää muokata — sitä on jo arvosteltu.")
+		a.flash(w, "Kappaletta on jo arvosteltu, joten sitä ei voi muokata.")
 	} else {
 		a.flash(w, "Tiedot tallennettu.")
 	}
@@ -319,7 +319,7 @@ func (a *app) deleteSong(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if affected(res) == 0 {
-		a.flash(w, "Kappaletta ei voi enää poistaa — sitä on jo arvosteltu.")
+		a.flash(w, "Kappaletta on jo arvosteltu, joten sitä ei voi poistaa.")
 		http.Redirect(w, r, fmt.Sprintf("/songs/%d", id), http.StatusSeeOther)
 		return
 	}