Fix: Internationalize hardcoded UI strings (Issue #1787)

- 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

module/data/activeEffect/baseEffect.mjs

@@ -133,7 +133,7 @@ export default class BaseEffect extends foundry.data.ActiveEffectTypeDataModel {
 
     static getDefaultObject() {
         return {
-            name: 'New Effect',
+            name: game.i18n.localize('DAGGERHEART.ACTIVE_EFFECT.NEW_EFFECT'),
             id: foundry.utils.randomID(),
             disabled: false,
             img: 'icons/magic/life/heart-cross-blue.webp',