Update auth_fail_get_user_name string

res/values/strings.xml

@@ -166,7 +166,7 @@
 	<string name="auth_connecting_auth_server">Connecting to authentication server…</string>
 	<string name="auth_unsupported_auth_method">The server does not support this authentication method</string>    
 	<string name="auth_unsupported_multiaccount">%1$s does not support multiple accounts</string>
-	<string name="auth_fail_get_user_name">Your server is not returning a correct user id, contact with your admin please</string>
+	<string name="auth_fail_get_user_name">Your server is not returning a correct user id, please contact an administrator</string>
     
     <string name="fd_keep_in_sync">Keep file up to date</string>
     <string name="common_rename">Rename</string>