Added Greek (el-gr) translation. (#4933)

* Add files via upload

added Greek Translations

* Update app_config.php

Added Greek (el-gr) translation.

* Update app_config.php

Added Greek (el-gr) translation.

* Update app_languages.php

Added Greek (el-gr) translation.

* Update app_menu.php

Added Greek (el-gr) translation.

* Update app_config.php

Added Greek (el-gr) translation.

* Update app_languages.php

Added Greek (el-gr) translation.

* Update app_menu.php

Added Greek (el-gr) translation.

* Update app_config.php

Added Greek (el-gr) translation.

* Added Greek (el-gr) translation.

Added Greek (el-gr) translation.

* Added Greek (el-gr) translation.

Added Greek (el-gr) translation.

* Added Greek (el-gr) translation.

* Added Greek (el-gr) translation.

* Added Greek (el-gr) translation.

* Update app_languages.php

corrected error on it-it overwrite

* Revert "Update app_languages.php"

This reverts commit 7883e3d72b10c69888d8df52fe22720d98e27a47.

* Update app_languages.php

* Update app_languages.php