added BS dialog for confirm

src/public/javascripts/dialogs/confirm.js

@@ -0,0 +1,38 @@
+const $dialog = $("#confirm-dialog");
+const $confirmContent = $("#confirm-dialog-content");
+const $okButton = $("#confirm-dialog-ok-button");
+const $cancelButton = $("#confirm-dialog-cancel-button");
+
+let resolve;
+
+function confirm(message) {
+    glob.activeDialog = $dialog;
+
+    $confirmContent.text(message);
+
+    $dialog.modal();
+
+    return new Promise((res, rej) => { resolve = res; });
+}
+
+$dialog.on('shown.bs.modal', () => $okButton.trigger("focus"));
+
+$dialog.on("hidden.bs.modal", () => {
+    if (resolve) {
+        resolve(false);
+    }
+});
+
+function doResolve(ret) {
+    resolve(ret);
+    resolve = null;
+
+    $dialog.modal("hide");
+}
+
+$cancelButton.click(() => doResolve(false));
+$okButton.click(() => doResolve(true));
+
+export default {
+    confirm
+}