Support Fish and Chips section

Section names are also used as the title of the list pages, but naming section folders as `Fish and Chips` and similar didn't work very well.

This commit fixes that.

This commit also changes the title casing of the section titles. Some may argue that this is a breaking change, but the old behaviour was also pretty broken,
even for languages that use title capitalizations, as it didn't follow any particular style guide, `fish and chips` became `Fish And Chips` etc.

Now it just turns the first letter into upper case, so `Fish and Chips` will be left as `Fish and Chips`.

People wanting the good old behaviour can use the `title` template func.

Fixes #1176

helpers/general.go

@@ -25,6 +25,8 @@ import (
 	"reflect"
 	"strings"
 	"sync"
+	"unicode"
+	"unicode/utf8"
 
 	"github.com/spf13/cast"
 	bp "github.com/spf13/hugo/bufferpool"
@@ -78,6 +80,15 @@ func GuessType(in string) string {
 	return "unknown"
 }
 
+// FirstUpper returns a string with the first character as upper case.
+func FirstUpper(s string) string {
+	if s == "" {
+		return ""
+	}
+	r, n := utf8.DecodeRuneInString(s)
+	return string(unicode.ToUpper(r)) + s[n:]
+}
+
 // ReaderToBytes takes an io.Reader argument, reads from it
 // and returns bytes.
 func ReaderToBytes(lines io.Reader) []byte {