To translate the texts used by the File Upload Field into your language, you will need to do an override of the following language strings: ACF_UPLOAD_DRAG_AND_DROP_FILES="Drag and drop files here or" ACF_UPLOAD_BROWSE="Browse" To learn how to create a language override in Joomla, visit: https://docs.joomla.org/J3.x:Language_Overrides_in_Joomla