feat(locale): sistema i18n YAML amb català i anglès

source/game/config_yaml.cpp

@@ -20,6 +20,7 @@ namespace ConfigYaml {
         Config::PlayerBindings& player1 = engine_config.player1;
         Config::PlayerBindings& player2 = engine_config.player2;
         bool& console = engine_config.console;
+        std::string& locale = engine_config.locale;
     }  // namespace
 
     // ========== FUNCIONS AUXILIARS PER CONVERSIÓ DE CONTROLES ==========
@@ -208,6 +209,9 @@ namespace ConfigYaml {
         rendering.render_width = Defaults::Rendering::RENDER_WIDTH_DEFAULT;
         rendering.render_height = Defaults::Rendering::RENDER_HEIGHT_DEFAULT;
 
+        // Idioma
+        locale = "ca";
+
         // Version
         version = std::string(Project::VERSION);
     }
@@ -446,6 +450,16 @@ namespace ConfigYaml {
             loadPlayer1ControlsFromYaml(yaml);
             loadPlayer2ControlsFromYaml(yaml);
 
+            // Idioma (opcional; valors admesos: "ca" | "en")
+            if (yaml.contains("locale")) {
+                try {
+                    auto val = yaml["locale"].get_value<std::string>();
+                    locale = (val == "ca" || val == "en") ? val : "ca";
+                } catch (...) {
+                    locale = "ca";
+                }
+            }
+
             if (console) {
                 std::cout << "Config carregada correctament desde: " << config_file_path
                           << '\n';
@@ -532,6 +546,9 @@ namespace ConfigYaml {
         file << "  render_height: " << rendering.render_height
              << "    # Parell amb render_width (720, 900, 1080, 1440, 2160)\n\n";
 
+        file << "# IDIOMA\n";
+        file << "locale: " << locale << "   # ca | en\n\n";
+
         // Guardar controls de jugadors
         savePlayer1ControlsToYaml(file);
         savePlayer2ControlsToYaml(file);