Handle registred trademark icon

overrides/css/theme.css

@@ -118,3 +118,8 @@ code, pre, kbd {
 #icinga-summit a {
   color: #e0009d;
 }
+
+.registered-sign {
+  vertical-align: top;
+  font-size: small;
+}

overrides/js/registered-sign.js

@@ -0,0 +1,54 @@
+function wrapRegisteredSign() {
+    const registeredSign = "®";
+    const registeredSignClass = "registered-sign";
+    const textNodes = document.evaluate(
+        "//*/text()",
+        document,
+        null,
+        XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
+        null
+    );
+
+    for (let i = 0; i < textNodes.snapshotLength; ++i) {
+        const textNode = textNodes.snapshotItem(i);
+        const parent = textNode.parentElement;
+
+        let registeredSignPos = textNode.textContent.indexOf(registeredSign);
+        if (
+            registeredSignPos === 0
+            && parent.tagName.toLowerCase() === "span"
+            && parent.getAttribute("class") === registeredSignClass
+        ) {
+            continue;
+        }
+
+        let registeredSignPositions = [];
+        while (registeredSignPos !== -1) {
+            registeredSignPositions.push(registeredSignPos);
+
+            registeredSignPos = textNode.textContent.indexOf(registeredSign, registeredSignPos + 1);
+        }
+        if (!registeredSignPositions.length) {
+            continue;
+        }
+
+        const newContent = document.createDocumentFragment();
+        let start = 0;
+        registeredSignPositions.forEach(function (position) {
+            const spanNode = document.createElement("span");
+            spanNode.setAttribute("class", registeredSignClass);
+            spanNode.appendChild(document.createTextNode(registeredSign));
+
+            newContent.appendChild(document.createTextNode(textNode.textContent.substring(start, position)));
+            newContent.appendChild(spanNode);
+
+            start = position + 1;
+        })
+      
+        newContent.appendChild(document.createTextNode(textNode.textContent.substring(start)));
+
+        parent.replaceChild(newContent, textNode);
+    }
+}
+
+document.addEventListener("DOMContentLoaded", wrapRegisteredSign);