Feature: Support for Nested Deep Folder Translations

[yob-yob]

This PR will allow support for nested directory structures for language files

Example:

Directory Structure: lang -> en -> pages -> dashboard.php
Group Key: pages/dashboard

This will also support even deeper structure

Example:

Directory Structure: lang -> en -> pages -> dashboard -> form.php
Group Key: pages/dashboard/form

This PR will also support vendor packages inner structure.

Example:

Directory Structure: lang -> vendor -> package -> en -> pages -> dashboard -> form.php
Group Key: package::pages/dashboard/form

[masoudniki]

why did not you merge this branch?