[BUG] Pluralization uses yml for template configuration, uses ctx.Tr method for rendering, returns no data

[beifeng778]

Describe the bug
Pluralization uses yml for template configuration, uses ctx.Tr method for rendering, returns no data.

iris.Version

• e.g. v12.2.5 or main

Additional context
code：

package main

import (
	"github.com/kataras/iris/v12"
	"strings"
)

const (
	female = iota + 1
	male
)

func main() {
	app := iris.New()
	err := app.I18n.Load("./locales/*/*", "en-US")
	// ^ here we only use a single locale for the sake of the example,
	// on a real app you can register as many languages as you want to support.
	if err != nil {
		panic(err)
	}

	app.Get("/", func(ctx iris.Context) {
		a := ctx.Tr("VarTemplatePlural", iris.Map{
			"PluralCount": 5,
			"Names":       []string{"John", "Peter"},
			"InlineJoin": func(arr []string) string {
				return strings.Join(arr, ", ")
			},
		})
		// Outputs: John, Peter are awesome

		b := ctx.Tr("VarTemplatePlural", 1, female)
		// Outputs: She is awesome!

		c := ctx.Tr("VarTemplatePlural", 2, female, 5)
		// Outputs: other (She) has 5 houses.
		ctx.WriteString(a + b + c)
	})

	app.Listen(`:8080`)

}

welcome.yml:

Vars:
  - Houses:
      one: "house"
      other: "houses"
  - Gender:
      "=1": "She"
      "=2": "He"

VarTemplatePlural:
  one: "${Gender} is awesome!"
  other: "other (${Gender}) has %[3]d ${Houses}."
  "=5": "{{call .InlineJoin .Names}} are awesome."

[kataras]

Hello @beifeng778 I ran your example and it seems that there is no issue here, the response is: John, Peter are awesome.She is awesome!other (She) has 5 houses. Can you explain the problem a bit more?