diff --git a/umap/static/umap/js/modules/panel.js b/umap/static/umap/js/modules/panel.js
index 3e612b74..7839f7f0 100644
--- a/umap/static/umap/js/modules/panel.js
+++ b/umap/static/umap/js/modules/panel.js
@@ -1,48 +1,46 @@
+import { DomUtil, DomEvent } from '../../vendors/leaflet/leaflet-src.esm.js'
+import { translate } from './i18n.js'
+
 export class Panel {
   MODE = 'condensed'
   CLASSNAME = 'left'
 
+
   constructor(parent) {
     this.parent = parent
-    this.container = L.DomUtil.create('div', '', this.parent)
-    L.DomEvent.disableClickPropagation(this.container)
-    L.DomEvent.on(this.container, 'contextmenu', L.DomEvent.stopPropagation) // Do not activate our custom context menu.
-    L.DomEvent.on(this.container, 'wheel', L.DomEvent.stopPropagation)
-    L.DomEvent.on(this.container, 'MozMousePixelScroll', L.DomEvent.stopPropagation)
-  }
-
-  resetClassName() {
-    this.container.className = `with-transition panel ${this.CLASSNAME} ${this.MODE}`
+    this.container = DomUtil.create('div', '', this.parent)
+    DomEvent.disableClickPropagation(this.container)
+    DomEvent.on(this.container, 'contextmenu', DomEvent.stopPropagation) // Do not activate our custom context menu.
+    DomEvent.on(this.container, 'wheel', DomEvent.stopPropagation)
+    DomEvent.on(this.container, 'MozMousePixelScroll', DomEvent.stopPropagation)
   }
 
   open(e) {
     //this.fire('panel:open')
-    // We reset all because we can't know which class has been added
-    // by previous ui processes...
-    this.resetClassName()
+    this.container.className = `with-transition panel ${this.CLASSNAME} ${this.MODE}`
     this.container.innerHTML = ''
-    const actionsContainer = L.DomUtil.create('ul', 'toolbox', this.container)
-    const body = L.DomUtil.create('div', 'body', this.container)
+    const actionsContainer = DomUtil.create('ul', 'toolbox', this.container)
+    const body = DomUtil.create('div', 'body', this.container)
     if (e.data.html.nodeType && e.data.html.nodeType === 1)
       body.appendChild(e.data.html)
     else body.innerHTML = e.data.html
-    const closeLink = L.DomUtil.create('li', 'umap-close-link', actionsContainer)
-    L.DomUtil.add('i', 'icon icon-16 icon-close', closeLink)
-    closeLink.title = L._('Close')
-    const resizeLink = L.DomUtil.create('li', 'umap-resize-link', actionsContainer)
-    L.DomUtil.add('i', 'icon icon-16 icon-resize', resizeLink)
-    resizeLink.title = L._('Toggle size')
+    const closeLink = DomUtil.create('li', 'umap-close-link', actionsContainer)
+    DomUtil.add('i', 'icon icon-16 icon-close', closeLink)
+    closeLink.title = translate('Close')
+    const resizeLink = DomUtil.create('li', 'umap-resize-link', actionsContainer)
+    DomUtil.add('i', 'icon icon-16 icon-resize', resizeLink)
+    resizeLink.title = translate('Toggle size')
     if (e.actions) {
       for (let i = 0; i < e.actions.length; i++) {
         actionsContainer.appendChild(e.actions[i])
       }
     }
-    if (e.className) L.DomUtil.addClass(this.container, e.className)
-    if (L.DomUtil.hasClass(this.container, 'on')) {
+    if (e.className) DomUtil.addClass(body, e.className)
+    if (DomUtil.hasClass(this.container, 'on')) {
       // Already open.
       //this.fire('panel:ready')
     } else {
-      L.DomEvent.once(
+      DomEvent.once(
         this.container,
         'transitionend',
         function (e) {
@@ -50,10 +48,10 @@ export class Panel {
         },
         this
       )
-      L.DomUtil.addClass(this.container, 'on')
+      DomUtil.addClass(this.container, 'on')
     }
-    L.DomEvent.on(closeLink, 'click', this.close, this)
-    L.DomEvent.on(resizeLink, 'click', this.resize, this)
+    DomEvent.on(closeLink, 'click', this.close, this)
+    DomEvent.on(resizeLink, 'click', this.resize, this)
   }
 
   resize() {
@@ -69,8 +67,8 @@ export class Panel {
   }
 
   close() {
-    if (L.DomUtil.hasClass(this.container, 'on')) {
-      L.DomUtil.removeClass(this.container, 'on')
+    if (DomUtil.hasClass(this.container, 'on')) {
+      DomUtil.removeClass(this.container, 'on')
       //this.fire('panel:closed')
     }
   }