In Player.cpp in Player::ApplyEnchantment
Change this:
    // visualize enchantment at player and equipped items
    if (slot == PERM_ENCHANTMENT_SLOT)
        SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 0, apply ? item->GetEnchantmentId(slot) : 0);

    if (slot == TEMP_ENCHANTMENT_SLOT)
        SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 1, apply ? item->GetEnchantmentId(slot) : 0);

to this:
    if (uint32 entry = sEnchantVisuals->GetEnchantVisual(item))
    {
        if (slot == PERM_ENCHANTMENT_SLOT)
            SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 0, apply ? entry : 0);
        if (slot == TEMP_ENCHANTMENT_SLOT)
            SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 1, apply ? entry : 0);
    }
    else
    {
        // visualize enchantment at player and equipped items
        if (slot == PERM_ENCHANTMENT_SLOT)
            SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 0, apply ? item->GetEnchantmentId(slot) : 0);

        if (slot == TEMP_ENCHANTMENT_SLOT)
            SetUInt16Value(PLAYER_VISIBLE_ITEM_1_ENCHANTMENT + (item->GetSlot() * 2), 1, apply ? item->GetEnchantmentId(slot) : 0);
    }