* correct bengali language code

* fix language code, replace spanish links with english

* lint

* greek language code is el not gr

* reorganize files

1. make it easier to find files
2. reduce scrolling to get to README on main view of repo

* remove tr.txt again

* Added greek programming books and removed an SQL book with dead link

* alphabetize

* alphabetize greek
Co-authored-by: NRantosKonstantinos <k.rantos@users.noreply.github.com>
Co-authored-by: NEric Hellman <eric@hellman.net>

* added c++ book

* added C section and book

* added data-structures java book

* add Creative Scala - Greek translation

* line brake

* Add Greek PDF for SQL Servers

Add the greek book (pdf) about database systems, sql server. 

English: Database Systems - Theory and practice
Greek title: Συστήματα Βάσεων Δεδομένων - Θεωρία και πρακτική εφαρμογή

* Add the (PDF) suffix

* Fix the line between last section and next heading

CC BY-SA Ebook translated by greek ubuntu group