feat/translations

• feat: translate common phrases
• chore: add changelog entry

composer.json

 {
-    "name": "wpdesk/wp-builder",
-    "authors": [
-        {
-            "name": "Krzysiek",
-            "email": "krzysiek@wpdesk.pl"
-        }
-    ],
-    "require": {
-        "php": ">=5.5"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "<7",
-        "wp-coding-standards/wpcs": "^0.14.1",
-        "squizlabs/php_codesniffer": "^3.0.2",
-        "mockery/mockery": "*",
-        "10up/wp_mock": "*",
-        "wimg/php-compatibility": "^8"
-    },
-    "autoload": {
-		"psr-4": {"WPDesk\\PluginBuilder\\": "src/"},
-		"classmap": ["src/Plugin/WithoutNamespace"]
-    },
-    "autoload-dev": {
-    },
-    "scripts": {
-        "phpcs": "phpcs",
-        "phpunit-unit": "phpunit --configuration phpunit-unit.xml --coverage-text --colors=never",
-        "phpunit-unit-fast": "phpunit --configuration phpunit-unit.xml --no-coverage",
-        "phpunit-integration": "phpunit --configuration phpunit-integration.xml --coverage-text --colors=never",
-        "phpunit-integration-fast": "phpunit --configuration phpunit-integration.xml --no-coverage"
-    }
+	"name": "wpdesk/wp-builder",
+	"authors": [
+		{
+			"name": "Krzysiek",
+			"email": "krzysiek@wpdesk.pl"
+		}
+	],
+	"require": {
+		"php": ">=5.5"
+	},
+	"require-dev": {
+		"phpunit/phpunit": "<7",
+		"wp-coding-standards/wpcs": "^0.14.1",
+		"squizlabs/php_codesniffer": "^3.0.2",
+		"mockery/mockery": "*",
+		"10up/wp_mock": "*",
+		"wimg/php-compatibility": "^8"
+	},
+	"autoload": {
+		"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",
+		"phpunit-unit-fast": "phpunit --configuration phpunit-unit.xml --no-coverage",
+		"phpunit-integration": "phpunit --configuration phpunit-integration.xml --coverage-text --colors=never",
+		"phpunit-integration-fast": "phpunit --configuration phpunit-integration.xml --no-coverage"
+	}
 }