Fix language keys in datetime field

[Giorgi625]

range_date_picker.php:23,31: wrong language keys
File: components/com_joomcck/fields/datetime/tmpl/filter/range_date_picker.php
Change Text::('FROM') → Text::('CFROM')
Change Text::('TO') → Text::('CTO')
in com_joomcck.ini are used CFROM and CTO so with current FROM and TO when filtering datetime field even if page is on other language it display english text. if you add C letter to both language keys it will fix problem.

[andiamine]

Fixed