nls: improve translations and provide translator help comments

Reference: http://www.freelists.org/post/procps/backporting,1
Reported-by: Jim Warner <james.warner@comcast.net>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>

ps/parser.c

@@ -1134,7 +1134,7 @@ static const char *parse_all_options(void){
       return _("Garbage option.");
       break;
     default:
-      printf(_("                  ?    %s\n"),ps_argv[thisarg]);
+      printf("                  ?    %s\n",ps_argv[thisarg]);
       return _("Something broke.");
     } /* switch */
     if(err) return err;