Advanced Custom Fields Pro 6.4.0.1

* Core: Minor bug fixes

• Clone field: Improved Fields setting to show all fields within a matching field group search
• Flexible Content field: Fixed bug causing layout_title filter to fail when field is cloned
• Flexible Content field: Added missing translate_field function
• WYSIWYG field: Fixed JS error when using CKEditor plugin
• Date Picker field: Improved Display Format and Return Formatsettings UI
• Time Picker field: Same as above
• Datetime Picker field: Same as above
• Core: Added new remove_wp_meta_box setting
• Core: Added constants ACF, ACF_PRO, ACF_VERSION and ACF_PATH
• Core: Improved compatibility with Select2 v4 including sortable functionality
• Language: Updated Portuguese translation - thanks to Pedro Mendonça

Tab field: Allowed HTML within field label to show in tab
Core: Improved plugin update class
Language: Updated Portuguese translation - thanks to Pedro Mendonça
Language: Updated Brazilian Portuguese translation - thanks to Rafael Ribeiro