- Replace hardcoded 'Inventory Items', 'Character Items', 'Other' with i18n keys
- Internationalize 'New Effect' default name in active effects
- Fix hardcoded 'Roll Formula' and 'Formula Roll' labels in roll tables
- Add translation keys to lang/en.json for proper localization support
- Ensures all UI strings can be translated to other languages
Fixes#1787: I18n: Some UI strings still seem to be hardcoded