Add some tweaks to hide the add-poi-marker when a layer is enabled

UI/SimpleAddUI.ts

@@ -27,6 +27,7 @@ export class SimpleAddUI extends UIElement {
     }>
         = new UIEventSource(undefined);
     private confirmButton: UIElement = undefined;
+    private openLayerControl: UIElement;
     private cancelButton: UIElement;
     private goToInboxButton: UIElement = new SubtleButton("./assets/envelope.svg", 
         Translations.t.general.goToInbox, {url:"https://www.openstreetmap.org/messages/inbox", newTab: false});
@@ -100,19 +101,24 @@ export class SimpleAddUI extends UIElement {
                         }
                     )
 
-                
-
 
                 this._addButtons.push(button);
             }
         }
-        
+
         this.cancelButton = new SubtleButton(
             "./assets/close.svg",
             Translations.t.general.cancel
         ).onClick(() => {
             self._confirmPreset.setData(undefined);
         })
+
+        this.openLayerControl = new SubtleButton(
+            "./assets/layers.svg",
+            Translations.t.general.add.openLayerControl
+        ).onClick(() => {
+            State.state.layerControlIsOpened.setData(true);
+        })
     }
 
     private CreatePoint(tags: Tag[], layerToAddTo: FilteredLayer) {

UI/i18n/Translations.ts

@@ -379,6 +379,10 @@ export default class Translations {
                     fr: "Ajouter un/une {category} ici",
                     gl: "Engadir {category} aquí",
                     de: "Hier eine {category} hinzufügen"
+                }),
+                openLayerControl: new T({
+                    "en": "Open the layer control box",
+                    "nl": "Open de laag-instellingen"
                 })
             },
             pickLanguage: new T({