add English messages

_locales/en/messages.json

@@ -0,0 +1 @@
+{
	"config": {
		"message": "en"
	},
	"manifest_name": {
		"message": "ShopAI",
		"description": "Extension name"
	},
	"manifest_description": {
		"message": "Shop wisely with AI!",
		"description": "Extension description"
	},
	"GUI_welcome_headline": {
		"message": "Welcome to ShopAI!",
		"description": "Welcome message"
	},
	"GUI_welcome_headline": {
		"message": "You’ve got version $manifest_version$.",
		"description": "Version number of welcome message",
		"placeholders": {
			"manifest_version": {
				"content": "$1",
				"description": "The manifest version"
			}
		}
	}
}