Add support for ContentDB package translation (#14410)

builtin/mainmenu/content/dlg_contentstore.lua

@@ -154,7 +154,9 @@ local function start_install(package, reason)
 
 				if conf_path then
 					local conf = Settings(conf_path)
-					conf:set("title", package.title)
+					if not conf:get("title") then
+						conf:set("title", package.title)
+					end
 					if not name_is_title then
 						conf:set("name", package.name)
 					end
@@ -642,8 +644,21 @@ local function fetch_pkgs()
 		end
 	end
 
+	local languages
+	local current_language = core.get_language()
+	if current_language ~= "" then
+		languages = { current_language, "en;q=0.8" }
+	else
+		languages = { "en" }
+	end
+
 	local http = core.get_http_api()
-	local response = http.fetch_sync({ url = url })
+	local response = http.fetch_sync({
+		url = url,
+		extra_headers = {
+			"Accept-Language: " .. table.concat(languages, ", ")
+		},
+	})
 	if not response.succeeded then
 		return
 	end

src/script/lua_api/l_mainmenu.cpp

@@ -933,6 +933,17 @@ int ModApiMainMenu::l_get_video_drivers(lua_State *L)
 	return 1;
 }
 
+/******************************************************************************/
+int ModApiMainMenu::l_get_language(lua_State *L)
+{
+	std::string lang = gettext("LANG_CODE");
+	if (lang == "LANG_CODE")
+		lang = "";
+
+	lua_pushstring(L, lang.c_str());
+	return 1;
+}
+
 /******************************************************************************/
 int ModApiMainMenu::l_gettext(lua_State *L)
 {
@@ -1151,6 +1162,7 @@ void ModApiMainMenu::Initialize(lua_State *L, int top)
 	API_FCT(get_mainmenu_path);
 	API_FCT(show_path_select_dialog);
 	API_FCT(download_file);
+	API_FCT(get_language);
 	API_FCT(gettext);
 	API_FCT(get_video_drivers);
 	API_FCT(get_window_info);
@@ -1191,5 +1203,6 @@ void ModApiMainMenu::InitializeAsync(lua_State *L, int top)
 	API_FCT(download_file);
 	API_FCT(get_min_supp_proto);
 	API_FCT(get_max_supp_proto);
+	API_FCT(get_language);
 	API_FCT(gettext);
 }

src/script/lua_api/l_mainmenu.h

@@ -74,6 +74,8 @@ class ModApiMainMenu: public ModApiBase
 
 	static int l_get_mapgen_names(lua_State *L);
 
+	static int l_get_language(lua_State *L);
+
 	static int l_gettext(lua_State *L);
 
 	//packages