Item action and kind schemas with texts in seven languages

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locale/schema_ja.properties

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+items/schema/builtin/item_add = アイテムを渡す
+items/schema/builtin/item_add_desc = 宝箱、贈り物、マップでの拾い物
+items/schema/field/item = アイテム
+items/schema/field/count = 個数
+items/schema/kind/item = アイテム
+items/schema/kind/item_desc = かばんの中身すべて：食べ物、薬、装備
+items/schema/field/name = 名前
+items/schema/field/description = 説明
+items/schema/field/cost = コスト
+items/schema/field/picture = 画像
+items/schema/field/item_type = アイテムの種類
+items/schema/field/item_type_desc = カンマ区切り：Resource、Food、Used、TargetUsed、Quest、Recipe、CantDrop
+items/schema/field/item_action = アイテムの行動
+items/schema/field/item_action_desc = action/heal、action/equip、action/stat_up… または null