[Spoiler!] Playing in Japanese Language mode, text overflows in ADV mode [Spoiler!]

The reporter [(same as this issue)](https://github.com/07th-mod/matsuribayashi/issues/10) is using the following configuration:
- Higurashi Ch.8
- Full patch
- Steam
- Windows 10
- Installed 2020/07/12

Their report:
> and the text with long lines goes past the text box, cutting off (solved by using nvl format)

Notably, this player is playing in Japanese mode, which may not have been tested well.

Here are some images of the "japanese text overflow" issue


检查日语模式下的ADV模式文本渲染逻辑。确定文本框边界定义的位置以及换行处理方式。通过在日语模式下使用长行运行游戏来测试更改，确保文本适合框内。

由索引模型根据 Issue 内容生成。