var tys = $('.kmessage-thankyou');

for (var i = 0; i < tys.length; i++)
{
    var src = $(tys[i]);
    var oldHTML = src.html();
    var re = /and this user have (\d+) others thankyou/;
    oldHTML = oldHTML.replace(re, "+ $1 other(s)");
    oldHTML = oldHTML.replace(/The following user\(s\) said Thank You:/,"Users that have thanked this post: ");
    src.html(oldHTML);
}