* SEO Pack: Fixed some cases of infinite redirects and 404 caused by duplicated translations occurring during database upgrade
* SEO Pack: Fixed incorrectly adding -2 suffixes in some cases when trying to ensure slug uniqueness
* SEO Pack: Fixed case of migrating duplicated translation slugs due to a bug in the previous method of slug storage
* SEO Pack: Fixed issue with translating non-latin slugs in String Translation
* SEO Pack: Improved String Translation Slugs editor by showing inactive post type base slugs and taxonomies
* SEO Pack: Improved front-end speed and avoid possible timeouts if the database upgrade has not been performed yet
* SEO Pack: Improved loading time of String Translation by counting items in SQL
