Implemented new LDB field "System.easyrpg_apply_lang_from_save" to ch…

…eck if the Player should automatically apply the startup language from the latest save file

Also, formatting & compiler warning

src/scene.cpp

@@ -376,9 +376,11 @@ void Scene::PushTitleScene(bool pop_stack_top) {
 	if (!Player::startup_language.empty()) {
 		Player::translation.SelectLanguage(Player::startup_language);
 	} else if (Player::translation.HasTranslations()) {
-		std::string lang = Player::translation.GetLatestSavegameLanguage();
-		if (lang != "default") {
-			Player::translation.SelectLanguage(lang);
+		if (Player::translation.IsApplyLanguageFromSavefiles()) {
+			std::string lang = Player::translation.GetLatestSavegameLanguage();
+			if (lang != "default") {
+				Player::translation.SelectLanguage(lang);
+			}
 		}
 		if (Player::player_config.lang_select_on_start.Get() == ConfigEnum::StartupLangSelect::Always
 			|| (!FileFinder::HasSavegame() && Player::player_config.lang_select_on_start.Get() == ConfigEnum::StartupLangSelect::FirstStartup)) {

src/scene_save.cpp

@@ -137,8 +137,7 @@ bool Scene_Save::Save(std::ostream& os, int slot_id, bool prepare_save) {
 #ifdef LIBLCF_HAS_LANG_FIELD
 	if (!Tr::HasActiveTranslation()) {
 		save.easyrpg_data.language = lcf::DBString(lcf::rpg::SaveEasyRpgData::kDefaultLanguage);
-	}
-	else {
+	} else {
 		save.easyrpg_data.language = lcf::DBString(Player::translation.GetCurrentLanguage().lang_dir);
 	}
 #endif

src/scene_settings.cpp

@@ -269,6 +269,7 @@ void Scene_Settings::vUpdate() {
 		case Window_Settings::eAudio:
 		case Window_Settings::eAudioMidi:
 		case Window_Settings::eAudioSoundfont:
+		case Window_Settings::eLanguage:
 		case Window_Settings::eLicense:
 		case Window_Settings::eEngine:
 		case Window_Settings::eInputButtonCategory:

src/translation.cpp

@@ -158,6 +158,14 @@ const std::vector<Language>& Translation::GetLanguages() const
 	return languages;
 }
 
+bool Translation::IsApplyLanguageFromSavefiles() {
+#ifdef LIBLCF_HAS_LANG_FIELD
+	return lcf::Data::system.easyrpg_apply_lang_from_save;
+#else
+	return false;
+#endif
+}
+
 std::string Translation::GetLatestSavegameLanguage() {
 	// TODO: Disable for platforms with slow I/O
 

src/translation.h

@@ -194,6 +194,11 @@ class Translation {
 	 */
 	void SelectLanguage(StringView lang_id);
 
+	/*
+	  Determines if the game language should be automatically detected and set from save files.
+	*/
+	bool IsApplyLanguageFromSavefiles();
+
 	/**
 	* Looks up the latest savegame from the Save folder and returns the defined language.
 	*