Some hack around inspired by this topic 
<script>
Discourse.HTML['categoryStyle'] = function(category) {
var color = Em.get(category, 'color'),
textColor = Em.get(category, 'text_color');
if (!color && !textColor) { return; }
// Add the custom style if we need to
var style = "";
if (color) {
style += "border: 2px solid #" + color + "; ";
style += "color: #" + color + "; ";
}
return style;
}
Discourse.HTML['categoryBadge'] = function(category, opts) {
opts = opts || {};
if ((!category) ||
(!opts.allowUncategorized &&
Em.get(category, 'id') === Discourse.Site.currentProp("uncategorized_category_id") &&
Discourse.SiteSettings.suppress_uncategorized_badge
)
) return "";
var name = Em.get(category, 'name'),
description = Em.get(category, 'description_text'),
restricted = Em.get(category, 'read_restricted'),
url = Discourse.getURL("/c/") + Discourse.Category.slugFor(category),
elem = (opts.link === false ? 'span' : 'a'),
extraClasses = (opts.extraClasses ? (' ' + opts.extraClasses) : ''),
html = "<" + elem + " href=\"" + (opts.link === false ? '' : url) + "\" ",
categoryStyle;
// Parent stripe implies onlyStripe
if (opts.onlyStripe) { opts.showParent = true; }
html += "data-drop-close=\"true\" class=\"badge-category" + (restricted ? ' restricted' : '' ) +
(opts.onlyStripe ? ' clear-badge' : '') +
extraClasses + "\" ";
name = Handlebars.Utils.escapeExpression(name);
// Add description if we have it, without tags. Server has sanitized the description value.
if (description) html += "title=\"" + Handlebars.Utils.escapeExpression(description) + "\" ";
categoryStyle = Discourse.HTML.categoryStyle(category);
if (categoryStyle) {
html += "style=\"" + categoryStyle + "\" ";
}
if (restricted) {
html += "><div><i class='fa fa-group'></i> " + name + "</div></" + elem + ">";
} else {
html += ">" + name + "</" + elem + ">";
}
return html;
}
</script>