Comment section – some non-translated elements

Hi there, Thanks for the awesome theme! It is used by us on a German-language website. Unfortunately, there are translation issues in some places. For one, the word "Menu" is not customizable ("Menü" in German). We were able to solve this with an adapted theme file in our child theme. But the comment section causes bigger problems. It is still set to English regarding time and number of comments, although our WP is globally set to German. And, finally, "meta-nav" is still in English. Please see screenshot for all three issues. How can we change this to German? Thank you! - Simon