1.3.1 Quick fixes and translations

Quick fixes for missing translations and minor build issues
For all major release changes, please check out 1.3.0
https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v1.3.0

What's Changed

Minor Enhancements

• fix: add missing MediaType import in SplitPdfBySectionsController by @Ludy87 in #4393

Translation Changes

• 🌐 Sync Translations + Update README Progress Table by @stirlingbot[bot] in #4386

Other Changes

• Bump version from 1.3.0 to 1.3.1 by @Frooodle in #4395

Full Changelog: v1.3.0...v1.3.1