Update characters_base implementation, assets and documentation

locale/s4_en.properties

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+characters/schema/field/loot = Loot
+characters/schema/field/loot_desc = What drops from the character when it is defeated as an enemy: an item, a count and a chance.
+characters/schema/field/loot_item = Item
+characters/schema/field/loot_min = At least
+characters/schema/field/loot_max = At most
+characters/schema/field/loot_probability = Chance, %
+characters/schema/field/loot_probability_desc = From 0 to 100: how likely the item drops.

locale/s4_ru.properties

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+characters/schema/field/loot = Добыча
+characters/schema/field/loot_desc = Что выпадает из персонажа, когда его побеждают как врага: предмет, число и шанс.
+characters/schema/field/loot_item = Предмет
+characters/schema/field/loot_min = Не меньше
+characters/schema/field/loot_max = Не больше
+characters/schema/field/loot_probability = Шанс, %
+characters/schema/field/loot_probability_desc = От 0 до 100: с каким шансом предмет выпадет.