save image as postscript side-effect (PR#6742)

Full_Name: Martin N?llenburg
Version: 1.8.1
OS: Win XP
Submission from: (NULL) (141.52.232.84)


When I try to save any image produced by the plot command by choosing "file ->
save as -> postscript..." in the menu, the settings for the decimal point are
changed from '.' to ',' somehow. 
In the postscript output all '.' are replaced by ',' as well, so the file cannot
be opened. Furthermore when I type e.g. "3.4" afterwards at the prompt, the next
line is just "3":

3.4

[1] 3