TagCustom 2.1 is a quality and UX update focused on languages, command cleanup, GUI polish, and LuckPerms workflows.

- Added Portuguese player messages.
- Added /tag lang portuguese and /tag len portuguese.
- Improved language aliases for English, Spanish, and Portuguese.
- Improved command cleanup so public usage focuses on /tag and /tags.
- Improved the /tags GUI with page and available-tag indicators.
- Improved console logs and error messages.
- Improved LuckPerms group tag workflow.
- Updated README, changelog, and publication descriptions for 2.1.