feat(giscus): expose language option for Comments component (#2012)

* add language support for Comment

* docs: let users know they can customize their language preference

quartz/components/scripts/comments.inline.ts

@@ -55,6 +55,7 @@ type GiscusElement = Omit<HTMLElement, "dataset"> & {
     strict: string
     reactionsEnabled: string
     inputPosition: "top" | "bottom"
+    lang: string
   }
 }
 
@@ -78,7 +79,7 @@ document.addEventListener("nav", () => {
   giscusScript.setAttribute("data-strict", giscusContainer.dataset.strict)
   giscusScript.setAttribute("data-reactions-enabled", giscusContainer.dataset.reactionsEnabled)
   giscusScript.setAttribute("data-input-position", giscusContainer.dataset.inputPosition)
-
+  giscusScript.setAttribute("data-lang", giscusContainer.dataset.lang)
   const theme = document.documentElement.getAttribute("saved-theme")
   if (theme) {
     giscusScript.setAttribute("data-theme", getThemeUrl(getThemeName(theme)))