Rejig the Translation panel controls and documentation to remove the emphasis

on received data. Experiment and suggestion suggest that the character set
configuration applies equally to keystrokes sent to the server, or at least
that that's close enough to being true that we should document it as a first
approximation.

[originally from svn r8209]

config.c

@@ -1577,8 +1577,8 @@ void setup_config_box(struct controlbox *b, int midsession,
 		  "Options controlling character set translation");
 
     s = ctrl_getset(b, "Window/Translation", "trans",
-		    "Character set translation on received data");
-    ctrl_combobox(s, "Received data assumed to be in which character set:",
+		    "Character set translation");
+    ctrl_combobox(s, "Remote character set:",
 		  'r', 100, HELPCTX(translation_codepage),
 		  codepage_handler, P(NULL), P(NULL));