I have Magento 2.2.5 website running successfully, but I am facing one serious issue on Minicart section and add to cart button. Everything get translated but on some browser like chrome and safari minicart and add to cart button are not translating. Can any one help me to fix this issue.
It seems like all your JS-translations are not working, are you using a translation-pack for the DE translations?
I faced the same issue with the sites that have translation csv in their custom theme. I couldn't find the best solution for it or the reason behind it. I found a work around for it. You can activate inline translation and manually translate/override that button.
Go to admin->store->configuration->advanced->developer. In translate inline, set enable for storefront to yes. Save config and then flush cache.
Go back to your site store front and edit the translation for add to cart button. Then with the same path on admin set enable for storefront to no. Save config and flush cache.
This will fix the issue but there is a draw back in it. The translation for that button may break time to time when you deploying static content. One way to fix it is to flush Static file cache & then flush Magento cache.
Basically this is not the best fix for the issue but it is a workaround.
Add to cart button) it is not translated in Chrome or Firefox. But if it is just related to chrome, may be it is because of site data and caching of chrome.