Added filter to alter wp_upload_dir() results.
Filter - Added comments for 'prso_gform_pluploader_wp_upload_dir' filter
Added i18n __() for all user messages
i18n:: Added filter to allow dev to set the plupload i18n script file to enqueue if required.
Merge branch 'feature/i18n' into develop
Added some actions/filters
Merge branch 'feature/i18n' into develop