Create a default task list on first app launch

Hide spinner in task dialog fragment when only one task list
Added some text in About

app/src/main/res/layout/activity_about.xml

@@ -9,6 +9,11 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     android:orientation="vertical"
     tools:context=".activities.AboutActivity">
+    <TextView
+        android:id="@+id/description_donext"
+        android:text="@string/donext_description"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
     <TextView
         android:id="@+id/version_donext"
         android:layout_width="wrap_content"