i18n: add the ability to register template funcs per locale

_examples/README.md

@@ -170,7 +170,8 @@
     * [Client-Side](compression/client/main.go)
     * [Client-Side (using Iris)](compress/client-using-iris/main.go)
 * Localization and Internationalization
-    * [i18n](i18n/main.go)
+    * [i18n](i18n)
+    * [i18n templates and functions](i18n/i18n-template)
 * Authentication, Authorization & Bot Detection 
     * [Basic Authentication](auth/basicauth/main.go)
     * [CORS](auth/cors)

_examples/i18n/i18n-template/main.go

@@ -1,12 +1,18 @@
 package main
 
 import (
-	"github.com/kataras/iris/v12"
+	"text/template"
 
+	"github.com/kataras/iris/v12"
 	// go get -u github.com/gertd/go-pluralize
 	"github.com/gertd/go-pluralize"
 )
 
+/*
+ Iris I18n supports text/template inside the translation values.
+ Follow this tutorial to learn how to use that feature.
+*/
+
 func main() {
 	app := newApp()
 	app.Listen(":8080")
@@ -16,18 +22,23 @@ func newApp() *iris.Application {
 	app := iris.New()
 
 	pluralize := pluralize.NewClient()
-	app.I18n.Loader.FuncMap = map[string]interface{}{
-		"plural": func(word string, count int) string {
-			// Your own implementation or use a 3rd-party package
-			// like we do here.
-			//
-			// Note that this is only for english,
-			// but you can accept the language code
-			// and use a map with dictionaries to
-			// pluralize words based on the given language.
-			return pluralize.Pluralize(word, count, true)
-		},
+
+	// Set custom functions per locale!
+	app.I18n.Loader.Funcs = func(current iris.Locale) template.FuncMap {
+		return template.FuncMap{
+			"plural": func(word string, count int) string {
+				// Your own implementation or use a 3rd-party package
+				// like we do here.
+				//
+				// Note that this is only for english,
+				// but you can accept the language code
+				// and use a map with dictionaries to
+				// pluralize words based on the given language.
+				return pluralize.Pluralize(word, count, true)
+			},
+		}
 	}
+
 	app.I18n.Load("./locales/*/*.yml", "en-US", "el-GR")
 
 	app.Get("/", func(ctx iris.Context) {

_examples/i18n/main.go

@@ -7,6 +7,10 @@ import (
 	"github.com/kataras/iris/v12"
 )
 
+/*
+	See i18n-template for a more advanced translation key-values.
+*/
+
 func newApp() *iris.Application {
 	app := iris.New()