Disable switching languages during cutscene tests

Not gonna lie, I am a bit disappointed at having to do this, because it
actually worked pretty well despite a few bugs depending on which
language you entered with. But that's only because I'm working with
the official translation files, which are in sync with each other.

With translation files that are completely arbitrary, it would be
apparent that switching languages during the cutscene test doesn't
really make sense. Like, at all. That's because the list of cutscenes is
populated entirely from language-specific XML and the cutscenes in them
are also from language-specific XML. So keeping the same position in the
menu doesn't really make sense, and keeping the same position in a
cutscene definitely doesn't make sense.

desktop_version/src/Game.cpp

@@ -6809,7 +6809,7 @@ void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
         option(loc::gettext("audio"));
         option(loc::gettext("game pad"));
         option(loc::gettext("accessibility"));
-        option(loc::gettext("language"));
+        option(loc::gettext("language"), !translator_cutscene_test);
         option(loc::gettext("return"));
         menuyoff = 0;
         maxspacing = 15;