Moved error message handling to a util file and added a link to the status site.

utils.js

@@ -66,3 +66,24 @@ function localizeHtmlPage() {
     }
 }
 
+/**
+ * Gets the error message in a nice string
+ * 
+ * @param {int} statusCode 
+ * @returns {string} errorMessage
+ */
+function getErrorMessage(statusCode) {
+    let errorMessage = "";
+                        
+    if([400, 429, 409, 502, 0].includes(statusCode)) {
+        //treat them the same
+        if (statusCode == 503) statusCode = 502;
+
+        errorMessage = chrome.i18n.getMessage(statusCode + "") + " " + chrome.i18n.getMessage("errorCode") + statusCode
+                        + "\n\n" + chrome.i18n.getMessage("statusReminder");
+    } else {
+        errorMessage = chrome.i18n.getMessage("connectionError") + statusCode;
+    }
+
+    return errorMessage;
+}