Zabbix

A.F....... [ZBX-18470] fixed unusefull timezone formatting; replaced comboboxes by CSelect elements for timezone selection

Merge in ZBX/zabbix from feature/ZBX-18470-5.1 to master

* commit '1c02f11787708fa67c9237103b8885c499882608':
  ..F....... [ZBX-18470] fixed label of default timezone option when no valid timezone is specified
  ..F....... [ZBX-18470] fixed minor coding style issue
  ..F....... [ZBX-18470] fixed 'reset default'
  ..F....... [ZBX-18470] added focusable element IDs
  ..F....... [ZBX-18470] reverted unneeded changes
  A.F....... [ZBX-18470] fixed unusefull timezone formatting; replaced comboboxes by CSelect elements for timezone selection

(cherry picked from commit 5147ade777e86d0a273de7d5032f249c8d9bb2bc)