didFailProvisionalNavigation error not localized

I have a localized app. I use WKWebView and also make some network requests. All the app localization works as expected. But errors from webView:didFailProvisionalNavigation:withError are always in English. I haven't found any information about any bugs on WebKit or Error side, but localizedDescription is always in English. Why?

Steps to reproduce:

1. Just create WKWebView and assign its delegate to self;
2. handle webView:didFailProvisionalNavigation:withError;
3. Enable airplane mode, switch off wifi and try to load any page;
4. You'll get connection error with wrong localization.