add error display

gui/scripts/logging.JS

@@ -0,0 +1,25 @@
+/*
+logging.JS
+Send messages for logging.
+*/
+
+export default class logging {
+  /*
+  Raise an error message.
+
+  @param {number} ERROR_CODE the error code
+  @param {number} ERROR_MESSAGE the custom error message
+  */
+  static error(ERROR_CODE, ERROR_MESSAGE, critical = true) {
+    (async () => {
+      // Import the templating.
+      const texts = await import(chrome.runtime.getURL("gui/scripts/read.JS"));
+
+      // Display the error message.
+      console.error(texts.read(`error_msg`, [ERROR_CODE, ERROR_MESSAGE]));
+      if (critical) {
+        alert(texts.read(`error_msg_GUI`, [String(ERROR_CODE)]))
+      };
+    })();
+  }
+}