Use the correct textdomain for the random faction mirror options

Fixes up commit 2e50233.

See issue #2709.

src/gui/dialogs/multiplayer/mp_create_game.cpp

@@ -269,8 +269,10 @@ void mp_create_game::pre_show(window& win)
 	//
 	std::vector<config> rfm_options;
 	for(const auto& type : rfm_types_) {
+		// HACK: The labels are defined for the wesnoth textdomain in a header,
+		//       see mp_game_settings::RANDOM_FACTION_MODE in src/mp_game_settings.hpp
 		rfm_options.emplace_back("label",
-			translation::sgettext(mp_game_settings::RANDOM_FACTION_MODE::enum_to_string(type).c_str())
+			translation::dsgettext("wesnoth", mp_game_settings::RANDOM_FACTION_MODE::enum_to_string(type).c_str())
 		);
 	};
 

src/mp_game_settings.hpp

@@ -62,6 +62,10 @@ struct mp_game_settings
 
 	bool saved_game;
 
+	// HACK: The Create Game dialog has special knowledge of these strings
+	//       and the fact that they're placed in the default (wesnoth)
+	//       textdomain by xgettext due to the absence of a GETTEXT_DOMAIN
+	//       declaration in this file. See gui2::dialogs::mp_create_game::pre_show().
 	MAKE_ENUM(RANDOM_FACTION_MODE,
 		(DEFAULT, N_("Independent"))
 		(NO_MIRROR, N_("No Mirror"))