added "backend log" dialog

src/public/javascripts/dialogs/backend_log.js

@@ -0,0 +1,32 @@
+import server from "../services/server.js";
+import utils from "../services/utils.js";
+
+const $dialog = $("#backend-log-dialog");
+const $backendLogTextArea = $("#backend-log-textarea");
+const $refreshBackendLog = $("#refresh-backend-log-button");
+
+export async function showDialog() {
+    utils.closeActiveDialog();
+
+    glob.activeDialog = $dialog;
+
+    $dialog.modal();
+
+    load();
+}
+
+function scrollToBottom() {
+    $backendLogTextArea.scrollTop($backendLogTextArea[0].scrollHeight);
+}
+
+async function load() {
+    const backendLog = await server.get('backend-log');
+
+    $backendLogTextArea.text(backendLog);
+
+    scrollToBottom();
+}
+
+$refreshBackendLog.on('click', load);
+
+$dialog.on('shown.bs.modal', scrollToBottom);