Here are the narrowest translations of "Reply" up to "Svar" (Danish/Norwegian), at least in my local font:
Our current list of ar/zh/yue/ja/nod and their fallbacks (T352289) are present here.
Missing are:
- gu (Gujarati) [ ઉત્તર ]. Example: https://gu.wikipedia.org/wiki/%E0%AA%9A%E0%AA%B0%E0%AB%8D%E0%AA%9A%E0%AA%BE:%E0%AA%AE%E0%AB%81%E0%AA%96%E0%AA%AA%E0%AB%83%E0%AA%B7%E0%AB%8D%E0%AA%A0?dtenable=1&uselang=gu
- ko (Korean) [ 답변 ]. Example: https://ko.wikipedia.org/wiki/%EC%9C%84%ED%82%A4%EB%B0%B1%EA%B3%BC%ED%86%A0%EB%A1%A0:%EB%8C%80%EB%AC%B8?dtenable=1&uselang=ko
- igl (Igala) [ Oyí ]. Currently has no wiki, just available as an interface language: https://meta.wikimedia.org/wiki/Talk:Main_Page?dtenable=1&uselang=igl