caption p,th p{visibility:hidden}
caption p:after,th p:after{visibility:visible}
.month:nth-child(1) caption p:after{content:"?"}
.month:nth-child(2) caption p:after{content:"?"}
.month:nth-child(3) caption p:after{content:"?"}
.month:nth-child(4) caption p:after{content:"?"}
.month:nth-child(5) caption p:after{content:"?"}
.month:nth-child(6) caption p:after{content:"?"}
.month:nth-child(7) caption p:after{content:"?"}
.month:nth-child(8) caption p:after{content:"?"}
.month:nth-child(9) caption p:after{content:"?"}
.month:nth-child(10) caption p:after{content:"?"}
.month:nth-child(11) caption p:after{content:"?"}
.month:nth-child(12) caption p:after{content:"?"}
th:nth-child(1) p:after{content:"?"}
th:nth-child(2) p:after{content:"?"}
th:nth-child(3) p:after{content:"?"}
th:nth-child(4) p:after{content:"?"}
th:nth-child(5) p:after{content:"?"}
th:nth-child(6) p:after{content:"?"}
th:nth-child(7) p:after{content:"?"}
For example Turkish
caption p,th p{visibility:hidden}
caption p:after,th p:after{visibility:visible}
.month:nth-child(1) caption p:after{content:"Ocak"}
.month:nth-child(2) caption p:after{content:"Şubat"}
.month:nth-child(3) caption p:after{content:"Mart"}
.month:nth-child(4) caption p:after{content:"Nisan"}
.month:nth-child(5) caption p:after{content:"Mayıs"}
.month:nth-child(6) caption p:after{content:"Haziran"}
.month:nth-child(7) caption p:after{content:"Temmuz"}
.month:nth-child(8) caption p:after{content:"Ağustos"}
.month:nth-child(9) caption p:after{content:"Eylül"}
.month:nth-child(10) caption p:after{content:"Ekim"}
.month:nth-child(11) caption p:after{content:"Kasım"}
.month:nth-child(12) caption p:after{content:"Aralık"}
th:nth-child(1) p:after{content:"Pt"}
th:nth-child(2) p:after{content:"Sa"}
th:nth-child(3) p:after{content:"Ça"}
th:nth-child(4) p:after{content:"Pe"}
th:nth-child(5) p:after{content:"Cu"}
th:nth-child(6) p:after{content:"Ct"}
th:nth-child(7) p:after{content:"Pz"}
/*th:nth-child(1) p:after{content:"Pazartesi"}
th:nth-child(2) p:after{content:"Salı"}
th:nth-child(3) p:after{content:"Çarşamba"}
th:nth-child(4) p:after{content:"Perşembe"}
th:nth-child(5) p:after{content:"Cuma"}
th:nth-child(6) p:after{content:"Cumartesi"}
th:nth-child(7) p:after{content:"Pazar"}*/