Creating supervised users restricted for regular users if they are supervised.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1496 matching lines @@
   </message>
     <message name="IDS_CREATE_SUPERVISED_USER_HTML" desc="Text with actual link shown on side of Google sign-in UI to create a supervised user.">
       <ph name="LINK_START">$1<ex>&gt;a&lt;</ex></ph>Create a supervised user<ph name="LINK_END">$2<ex>&gt;/a&lt;</ex></ph> for this device.
     </message>
   <message name="IDS_CREATE_SUPERVISED_USER_NO_MANAGER_TEXT" desc="Text shown when supervised user can be created, but no users that can be manager exist.">
     At least one account must exist on this device before creating a supervised user.
   </message>
   <message name="IDS_CREATE_SUPERVISED_USER_CREATION_RESTRICTED_TEXT" desc="Text shown when supervised user can be created, but owner of the device restricted supervised user creation or whitelist has been enabled for this device.">
     Creation of supervised users is restricted by the owner of this device.
   </message>
+  <message name="IDS_CREATE_SUPERVISED_USER_NO_MANAGER_EXCEPT_SUPERVISED_TEXT" desc="Text shown when supervised user can be created, but no users except regular supervised that can be manager exist.">
+    Sorry, you need to add at least one Google Account to this device before you can create a supervised user.
+  </message>
   <message name="IDS_CREATE_SUPERVISED_INTRO_TEXT_TITLE" desc="Supervised user dialog, intro page, title">
     What is a supervised user?
   </message>
   <message name="IDS_CREATE_SUPERVISED_INTRO_ALTERNATE_TEXT" desc="Supervised user dialog, intro page, first paragraph">
     A supervised user can explore the web with your guidance. As the manager of a supervised user, you can
     <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>allow or prohibit<ph name="END_BOLD">&lt;/strong&gt;</ph> certain websites,
     <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>review<ph name="END_BOLD">&lt;/strong&gt;</ph> websites the supervised user has visited, and
     <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>manage<ph name="END_BOLD">&lt;/strong&gt;</ph> other settings.
   </message>
   <message name="IDS_CREATE_SUPERVISED_INTRO_TEXT_1" desc="Supervised user dialog, intro page, first paragraph">
@@ skipping 4466 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>