Add supported_languages.txt to specify which languages are available in a game.

Readme_release.txt

@@ -44,6 +44,10 @@ If the DLC file is present, the emulator will only unlock the DLCs in that file.
 The contents of this file are: appid=DLC name
 See the steam_settings.EXAMPLE folder for an example.
 
+Languages:
+You can include a steam_settings\supported_languages.txt file with a list of languages that the game supports. If the global emu language setting is not in this list of languages the emu will default to the first language in the list.
+See the steam_settings.EXAMPLE folder for an example.
+
 Depots:
 This is pretty rare but some games might use depot ids to see if dlcs are installed. You can provide a list of installed depots to the game with a steam_settings\depots.txt file.
 See the steam_settings.EXAMPLE folder for an example.

dll/settings.h

@@ -156,6 +156,9 @@ public:
     //app build id
     int build_id = 10;
 
+    //supported languages
+    std::set<std::string> supported_languages;
+
     //make lobby creation fail in the matchmaking interface
     bool disable_lobby_creation = false;
 

dll/settings_parser.cpp

@@ -260,6 +260,41 @@ uint32 create_localstorage_settings(Settings **settings_client_out, Settings **s
         local_storage->store_data_settings("user_steam_id.txt", temp_text, strlen(temp_text));
     }
 
+    std::set<std::string> supported_languages;
+
+    {
+        std::string lang_config_path = Local_Storage::get_game_settings_path() + "supported_languages.txt";
+        std::ifstream input( utf8_decode(lang_config_path) );
+
+        std::string first_language;
+        if (input.is_open()) {
+            consume_bom(input);
+            for( std::string line; getline( input, line ); ) {
+                if (!line.empty() && line[line.length()-1] == '\n') {
+                    line.pop_back();
+                }
+
+                if (!line.empty() && line[line.length()-1] == '\r') {
+                    line.pop_back();
+                }
+
+                try {
+                    std::string lang = line;
+                    if (!first_language.size()) first_language = lang;
+                    supported_languages.insert(lang);
+                    PRINT_DEBUG("Added supported_language %s\n", lang.c_str());
+                } catch (...) {}
+            }
+        }
+
+        if (!supported_languages.count(language)) {
+            if (first_language.size()) {
+                memset(language, 0, sizeof(language));
+                first_language.copy(language, sizeof(language) - 1);
+            }
+        }
+    }
+
     bool steam_offline_mode = false;
     bool disable_networking = false;
     bool disable_overlay = false;
@@ -336,6 +371,8 @@ uint32 create_localstorage_settings(Settings **settings_client_out, Settings **s
     settings_server->warn_forced = warn_forced;
     settings_client->warn_local_save = local_save;
     settings_server->warn_local_save = local_save;
+    settings_client->supported_languages = supported_languages;
+    settings_server->supported_languages = supported_languages;
 
     {
         std::string dlc_config_path = Local_Storage::get_game_settings_path() + "DLC.txt";

files_example/steam_settings.EXAMPLE/supported_languages.EXAMPLE.txt

@@ -0,0 +1,8 @@
+english
+german
+french
+spanish
+schinese
+russian
+japanese
+latam