It is loaded successfully in both Chrome and Firefox for me. Try to clear the cache if you have cache plugin.
Only on the home page, the top news is not displayed /but it is displayed on the other pages/, which is probably some problem with Owl Carousel
The message “Error establishing a database connection” indicates that WordPress cannot connect to the database. This database is provided by your hosting provider. I would therefore recommend that you first contact their support team so they can look into this for you.