Enhanced menu item injection section

[hbugdoll]

What are you changing/introducing

• Added content discussed in Injection of a menu item throws 404 error luya-module-cms#58 and Menu should respect 'sort_index' attribute of any items luya-module-cms#62
  • alternative injection option
  • hint that the parent item must be available for current language
  • order of injected menu items

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