The Option in TextParser is not used

[cazeaux]

If we define a custom TemplateParser with some Option, the option has no effect.

Example:

bundle := NewBundle(language.English)
bundle.AddMessages(language.English, {ID: "Foo", Other: "Foo {{.bar}}!"}...)
conf := &LocalizeConfig{
  MessageID:      "Foo",
  TemplateData:   map[string]string{}, // empty data
  TemplateParser: &template.TextParser{Option: "missingkey=error"}, // I want an error if `bar` is not in data
}
localizer := NewLocalizer(bundle, []string{"en"})
s, err := localizer.Localize(conf)) // I expect an error here

This is because the .Option() is not used in TextParser.