Vanilla Backpacks: BH Pack V0.8.1

Vanilla Backpacks v0.8.1 Beta — Behavior Pack

- Fixed English and Spanish join messages, backpack messages and navigation tooltips.
- Improved language-aware inventory titles while preserving custom backpack names.
- Optimized backpack identification and dye conversions through shared indexed lookups.
- Removed duplicated and unused code, centralized recipe generation and modularized command handling.
- Prevented unrelated addon events from scheduling unnecessary work.
- Preserved storage capacities, recipes, item/block IDs, pack UUIDs and saved-content formats.
- Updated pack versions and dependencies to 0.8.1.

Requires Vanilla Backpacks Resource Pack v0.8.1.