Make some hardcoded room names (and some special ones) translatable

This involves loc::gettext_roomname and loc::gettext_roomname_special.

This commit is part of rewritten history of the localization branch.
The original (unsquashed) commit history can be found here:
https://github.com/Dav999-v/VVVVVV/tree/localization-orig

desktop_version/src/Script.cpp

@@ -3046,7 +3046,7 @@ void scriptclass::hardreset(void)
     game.timetrialcheater = false;
 
     game.totalflips = 0;
-    game.hardestroom = "Welcome Aboard";
+    game.hardestroom = loc::gettext_roomname(false, 13, 5, "Welcome Aboard", false);
     game.hardestroomdeaths = 0;
     game.currentroomdeaths=0;