chore: add required composer settings

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

composer.json

@@ -18,11 +18,22 @@
 		"wimg/php-compatibility": "^8"
 	},
 	"autoload": {
-		"psr-4": {"WPDesk\\PluginBuilder\\": "src/"},
-		"classmap": ["src/Plugin/WithoutNamespace"]
+		"psr-4": {
+			"WPDesk\\PluginBuilder\\": "src/"
+		},
+		"classmap": [
+			"src/Plugin/WithoutNamespace"
+		]
 	},
 	"autoload-dev": {
 	},
+	"extra": {
+		"text-domain": "wpdesk-wp-builder",
+		"translations-folder": "lang",
+		"po-files": {
+			"pl_PL": "pl_PL.po"
+		}
+	},
 	"scripts": {
 		"phpcs": "phpcs",
 		"phpunit-unit": "phpunit --configuration phpunit-unit.xml --coverage-text --colors=never",