Setting up for Malay Language. Copy & paste the following, save it as bootstrap-datepicker.my.js and include in your HTML pages as needed.

$.fn.datepicker.dates['my'] = {
    days: ["Ahad", "Isnin", "Selasa", "Rabu", "Khamis", "Jumaat", "Sabtu"],
    daysShort: ["Ahd", "Isn", "Sel", "Rab", "Kha", "Jum", "Sab"],
    daysMin: ["Ah", "Is", "Sl", "Rb", "Kh", "Jm", "Sa"],
    months: ["Januari", "Februari", "Mac", "April", "Mei", "Jun", "Julai", "Ogos", "September", "Oktober", "November", "Disember"],
    monthsShort: ["Jan", "Feb", "Mac", "Apr", "Mei", "Jun", "Jul", "Ogo", "Sep", "Okt", "Nov", "Dis"],
    today: "Hari Ini",
    clear: "Bersihkan"
};

Sample usage:

$('.input-daterange').datepicker({
    language: 'my',
    format: "MM yyyy",
    startDate: "Januari 2000",
    minViewMode: 1
});

Reference: Bootstrap DatePicker I18N