Put into javascript:

$(function () {
    function checkRtl( character ) {
        var RTL = ['ا','ب','پ','ت','س','ج','چ','ح','خ','د','ذ','ر','ز','ژ','س','ش','ص','ض','ط','ظ','ع','غ','ف','ق','ک','گ','ل','م','ن','و','ه','ی'];
        return RTL.indexOf( character ) > -1;
    };

    var divs = document.getElementsByTagName( 'div' );

    for ( var index = 0; index < divs.length; index++ ) {
        if( checkRtl( divs[index].textContent[0] ) ) {
            divs[index].className = 'rtl';
        } else {
            divs[index].className = 'ltr';
        };
    };
});


Put into CSS:
.rtl {
    direction: rtl; 
    text-align: right;
    unicode-bidi: bidi-override;
}

.ltr {
    direction: ltr; 
    text-align: left;
    unicode-bidi: bidi-override;
}