cvs maxima speaks in lisp instead english?



I've upgraded my maxima cvs tree recently and found the following
(C1) display2d:false;

(D1) FALSE
(C2) integrate(1/(a^2*cos(t)^2+1),t,0,%pi);

((MTEXT) Is  
 ((MTIMES SIMP) $a
  ((MPLUS SIMP) ((MEXPT SIMP) ((MEXPT SIMP) $a 2) ((RAT SIMP) 1 2))
   ((MTIMES SIMP RATSIMP) $a
    ((MEXPT SIMP) ((MPLUS SIMP) 1 ((MEXPT SIMP RATSIMP) $a 2))
     ((RAT SIMP) 1 2)))))
   positive, negative, or zero?)
(C3) build_info();
Maxima version: 5.9.0.1cvs
Maxima build date: 10:11 10/7/2003
host type: i686-pc-linux-gnu
lisp-implementation-type: Kyoto Common Lisp
lisp-implementation-version: GCL-2-6.0999999999999996


The same for clisp-2..31 and sbcl. Only maxima-cmucl  speaks english!

best regards
Valery