[pstricks] 'xelatex pstricks_test.tex' fails.

[Juergen Rose]

I have two files pstricks_test.tex and xelatex_test.tex. Both are
identically. 'xelatex xelatex_test.tex' works like a charm, 'xelatex
pstricks_test.tex' fails.

rose at leopard:/home_leopard/rose/Txt/projects/ClosePackingOfSpheres/Report(228)$  cat pstricks_test.tex
\documentclass[10pt,a4paper]{article}

\usepackage[utf8]{inputenc}

\usepackage{amsmath,amsfonts,amssymb}

\usepackage{pstricks,pst-grad}

\begin{document}
hello world

\begin{figure}[ht!]
  \begin{centering}
    \begin{pspicture}[](3,3)
      \pscircle*[linecolor=green](1.5,1.5){0.25}
    \end{pspicture}
    \caption{Circles}
    \label{fig:circles_0}
  \end{centering}
\end{figure}

\end{document}
rose at leopard:/home_leopard/rose/Txt/projects/ClosePackingOfSpheres/Report(229)$ diff xelatex_test.tex pstricks_test.tex
rose at leopard:/home_leopard/rose/Txt/projects/ClosePackingOfSpheres/Report(230)$ xelatex xelatex_test.tex >/dev/null; echo $?
0

rose at leopard:/home_leopard/rose/Txt/projects/ClosePackingOfSpheres/Report(231)$ xelatex pstricks_test.tex
This is XeTeX, Version 3.1415926-2.5-0.9999.3 (TeX Live 2013)
 restricted \write18 enabled.
entering extended mode
(./pstricks_test.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 16 languages loaded.
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
...
`pst-grad' v1.06, 2006/11/27 (tvz,dg,hv))) (./pstricks_test.aux

! Package babel Error: You haven't loaded the language english yet.

See the babel package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.3 \select at language{english}
                             
? 
! Emergency stop.
 ...                                              
                                                  
l.3 \select at language{english}
                             
No pages of output.
Transcript written on pstricks_test.log.


I found at http://tug.org/PSTricks/main.cgi/ , that it is not good to
use pstricks.tex as a filename. But nothing is written about
pstricks_test.tex.