include check to prevent adding username identical with static admin

in ConfigAccounts_p

htroot/ConfigAccounts_p.html

@@ -23,6 +23,8 @@
     <p class="error">Passwords do not match.</p>
     ::
     <p class="error">Username too short. Username must be &gt;= 4 Characters.</p>
+    ::
+    <p class="error">Username already used (not allowed).</p>
     #(/error)#
     #(passwordNotSetWarning)#::<div class="error">No password is set for the administration account. Please define a password for the admin account.</div>#(/passwordNotSetWarning)#
 

htroot/ConfigAccounts_p.java

@@ -185,7 +185,11 @@ public class ConfigAccounts_p {
                 prop.put("error", "2"); //PW does not match
                 return prop;
             }
-
+            // do not allow same username as staticadmin
+            if (username.equalsIgnoreCase(sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_USER_NAME,"admin"))) {
+                prop.put("error", "4");
+                return prop;
+            }
             final String firstName = post.get("firstname");
             final String lastName = post.get("lastname");
             final String address = post.get("address");

locales/master.lng.xlf

@@ -843,6 +843,9 @@
     <trans-unit id="6ad966f5" xml:space="preserve" approved="no" translate="yes">
        <source>Username too short. Username must be &amp;gt;= 4 Characters.</source>
     </trans-unit>
+    <trans-unit id="1bf77769" xml:space="preserve" approved="no" translate="yes">
+       <source>Username already used (not allowed).</source>
+    </trans-unit>
     <trans-unit id="e79780cf" xml:space="preserve" approved="no" translate="yes">
        <source>No password is set for the administration account.</source>
     </trans-unit>