Some fixes for the upcoming chapter

Oh wow, it has been a while hasn't it? Don't worry, production is still going. Decided to fix up a few things to prepare for the next chapter, mostly audio-visual related.

- fixed up some sound effects for the students at Yutakano High in Chapter 3 and 4.
- removed some voiced lines that kills immersion or was just mistranslations.
- attempted to change to photo of Nanashi and his mother in Chapter 2. He should look like a teenager now.