Print date and time in the Load/Save Game menus in the current locale

[fabiangreffrath]

Fixes #818

[Pedro-Beirao]

Right I had fixed this a few months ago but never did a PR, thanks!

In locales where the year is not abbreviated to 2 numbers, we need to increase SAVESTRINGSIZE to 26. Can you do it in this PR? Or I'll make another.

[fabiangreffrath]

In locales where the year is not abbreviated to 2 numbers, we need to increase SAVESTRINGSIZE to 26. Can you do it in this PR? Or I'll make another.

This will immediately introduce an incompatiblity with any older savegame.

[fabiangreffrath]

We could drop seconds:

--- a/prboom2/src/m_menu.c
+++ b/prboom2/src/m_menu.c
@@ -1482,7 +1482,7 @@ static void M_QuickSave(void)
   time (&now);
   timeinfo = localtime (&now);

-  strftime(description, sizeof(description), "quick %x %X", timeinfo);
+  strftime(description, sizeof(description), "quick %x %H:%M", timeinfo);

   G_SaveGame(QUICKSAVESLOT, description);
   doom_printf("%s", description);

[fabiangreffrath]

Or we abbreviate the "quick" string with e.g. a mere "q"?

[Pedro-Beirao]

I dont mind making older saves incompatible, we do it pretty often in dsda. But yea we would have to increase the SAVEVERSION as well.

Its possible users want multiple saves during a minute, so I think we should keep the seconds.
And I dont like how just the 'q' looks.

[fabiangreffrath]

Strictly speaking, we don't even need neither "QUICK" nor "Q" at all. We have an entire savegame page called "Q" just for these.

[Pedro-Beirao]

True 😅