Onboarding, fix in logbook list from file repo

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

@@ -6,6 +6,7 @@
     android:padding="20dp">
 
     <TextView
+        android:id="@+id/dialog_add_logbook_message"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="@string/dialog_add_logbook_message"/>

app/src/main/res/values/strings.xml

@@ -106,6 +106,7 @@
     <string name="dialog_add_logbook_title">Add logbook</string>
     <string name="dialog_add_logbook_logbookname">👶 Logbook name</string>
     <string name="dialog_add_logbook_message">Write a name to identify this logbook. This name will appear on top of the screen and, if you use WebDAV, will be in the save file name as well.</string>
+    <string name="dialog_add_logbook_message_intro">Welcome! To use this app you need to create at least one logbook. You would probably want to call it with your child\'s name.</string>
 
     <string name="default_logbook_name">👶 My first logbook</string>
     <string name="logbook_created">New logbook created: </string>