Added error50x template.

web/templates/error50x.jade

@@ -0,0 +1,22 @@
+extends base.jade
+
+block head
+	:go:func Error50x(mainSite string, code int, errorMsg string)
+	style(type="text/css").
+		#error {
+			font-size: 3.5rem;
+			line-height: 5rem;
+			text-align: center;
+			margin: 6rem 0; }
+
+		#error h1 { font-size: 8rem; }
+
+block header
+	h1 Internal Server Error
+
+block body
+	section#error
+		h1 #{code}
+		| #{http.StatusText(code)}
+        if errorMsg != ""
+            | #{errorMsg}

web/web.go

@@ -11,6 +11,7 @@ import (
 //go:generate $GOPATH/bin/jade -pkg=web -writer templates/deleted.jade
 //go:generate $GOPATH/bin/jade -pkg=web -writer templates/uploaded.jade
 //go:generate $GOPATH/bin/jade -pkg=web -writer templates/error404.jade
+//go:generate $GOPATH/bin/jade -pkg=web -writer templates/error50x.jade
 
 //go:embed assets
 var assetsDir embed.FS