This is your message according to Google Translate:
I downloaded and pasted the file and got this warning.
The site could not be contacted to check for any major errors, so the PHP change was rolled back. You will need to load the PHP file exchange in other ways using SFTP.
What is SFTP?
SFTP stands for Secure File Transfer Protocol, which is a popular method of transferring files between two remote systems – in this particular case from your computer to your server.
Your host should be able to provide you FTP access to the files in your server.
However, if you are not familiar or comfortable editing PHP files and using SFTP, I would recommend making sure that you have a backup of your site before making any changes.
One other thing you could try would be to remove the Storefront theme from your site and installing it again from scratch – that should restore any missing code.