Hi,
About wp engine, you have to disable in cPanel (you can ask for the hosting manager to do this). It is the extension of Hosting. You should disable this until you finish setting up for your site, then you can activate it again.
About translation, you can use plugin Loco Translate. It can translate for you the texts.
About changing cart icon, there is no option to do this. You can modify in header template or use css
I would like to remind you that you should do backup your site if you have any changing in Theme. If you customize, it is really important to do backup.
So when you update theme, all you changing / customization will be lost.
Regards,