Preparing version 2.1.15

- fixed a critical security issue reported by shimmeris
- PHP 8 compatibility

preparing version 2.1.14

- fixed various security issues reported by Mario Korth:

  * potential XSS
  * Arbitrary file read
  * Path traversal in listing directory contents
  * Path traversal in archive feature
- added new turkish translations

Preparing Version 2.1.11

- fixed "text.js not found" message on server when editing text files
- fixed PHP 7.2 incompatibility in Tar.php