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Thank you for contacting WPML Support. I took a look in your website and could confirm the issue, it seems something got corrupted in your WordPress installation or a third party plugin conflict is happening here. Please, proceed this way:
1 - Disable all the plugins except the WPML related plugins and try the page/post editor again. If it works activate one by one untill the culprit plugin is found.
2 - If it doesn't work, please, provide us with your FTP access details and we'll take a detailed look in your log files in order to see the real cause of it. A private reply is now enabled for you, so you can safelu send any access details.
Note: I edited your first message to delete the provided WordPress Dashboard access details for security reasons, please, only provide access credentials details using a private reply.
Please, let me know if you need any additional clarifications from our side. Have a nice day.