1.6.8

• Improvement: don't display the restore bulk action in the medias list if there is nothing to restore.
• Improvement: you can know select and unselect all image sizes at once in the settings page.
• Improvement: detect when the backup directory is not writable. A warning is displayed dynamically under the backup setting, a notice is also displayed on some pages.
• Improvement: some strings were still not translated in the bulk optimization page.
• Bug Fix: the "Save & Go to Bulk Optimizer" button now redirects you even if no settings have been changed.
• Lots of various small fixes and code improvements.