[рони]

Ubivectel,

document.addEventListener("click", ({ target }) => {
    if (target = target.closest('.KIDE_msg_hour')) {
        target = target.closest('.KIDE_msg_top')
        let text = target.textContent;
        kide.insertSmile(`[QUOTE]${text}[/QUOTE]`)// добавить теги
    }
});

filter_smilies: function(s) {
        s = " " + s + " ";
        for (let i = 0; i < this.smilies.length; i++) {
            s = s.replace(" " + this.smilies[i][0], '<img alt="' + this.smilies[i][0] + '" title="' + this.smilies[i][0] + '" src="' + this.smilies[i][1] + '" class="KIDE_icono" />');
            s = s.replace(" " + this.smilies[i][0].toLowerCase(), '<img alt="' + this.smilies[i][0] + '" title="' + this.smilies[i][0] + '" src="' + this.smilies[i][1] + '" class=KIDE_icono" />')
        }
 /* добавить замену*/
        let reg = /\[QUOTE\](.+)\[\/QUOTE\]/;
        while (reg.test(s)) {
        s = s.replace(reg, `<span class="KIDE_quote">$1</span>`)
        };
 /* добавить */
        return s;
    },

и в css добавить оформление

.KIDE_quote {
                  color: #8B4513;
              }