add translation for doc notes

src/public/app/doc_notes/en/launchbar_widget_launcher.html

@@ -0,0 +1,34 @@
+<p>Please define the target widget note in the promoted attributes. The widget will be used to render the launchbar icon.</p>
+
+<h4>Example launchbar widget</h4>
+
+<pre>
+const TPL = `&lt;div style="height: 53px; width: 53px;"&gt;&lt;/div&gt;`;
+
+class ExampleLaunchbarWidget extends api.NoteContextAwareWidget {
+    doRender() {
+        this.$widget = $(TPL);
+    }
+
+    async refreshWithNote(note) {
+        this.$widget.css("background-color", this.stringToColor(note.title));
+    }
+
+    stringToColor(str) {
+        let hash = 0;
+        for (let i = 0; i < str.length; i++) {
+            hash = str.charCodeAt(i) + ((hash << 5) - hash);
+        }
+
+        let color = '#';
+        for (let i = 0; i < 3; i++) {
+            const value = (hash >> (i * 8)) & 0xFF;
+            color += ('00' + value.toString(16)).substr(-2);
+        }
+
+        return color;
+    }
+}
+
+module.exports = new ExampleLaunchbarWidget();
+</pre>