Refactor i18n, add templating for resource app

app/services/i18n.go

@@ -0,0 +1,31 @@
+package services
+
+import (
+	"context"
+
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+
+	"git.cacert.org/oidc_login/common/services"
+)
+
+func AddMessages(ctx context.Context) {
+	messages := make(map[string]*i18n.Message)
+	messages["IndexGreeting"] = &i18n.Message{
+		ID:    "IndexGreeting",
+		Other: "Hello {{ .User }}",
+	}
+	messages["IndexTitle"] = &i18n.Message{
+		ID:    "IndexTitle",
+		Other: "Welcome to the Demo application",
+	}
+	messages["LogoutLabel"] = &i18n.Message{
+		ID:          "LogoutLabel",
+		Description: "A label on a logout button or link",
+		Other:       "Logout",
+	}
+	messages["IndexIntroductionText"] = &i18n.Message{
+		ID:    "IndexIntroductionText",
+		Other: "This is an authorization protected resource",
+	}
+	services.GetMessageCatalog(ctx).AddMessages(messages)
+}