Simplify generation of po4a.conf

There is no need to use a subshell for redirection; just redirect the output from the "cat" command directly.

create_po4a_conf.sh

 #!/bin/bash
 
-(cat <<EOF
+cat <<EOF >po4a.conf
 [po4a_langs] fr de
 [po4a_paths] po/documentation.pot \$lang:po/documentation.\$lang.po
 [options] opt: " -k 80"
 
 EOF
-) >po4a.conf 
 
 for f in $(cat sources.txt)
 do