Make the error page translatable so it can be localized

[sandycorzeta]

Summary

The error page on Misskey right now is providing two language at the same time (Japanese and English) and helpful enough. But in terms of user experience, it looks overwhelming and not straightforward. Besides, the error page seems hardcoded for this.

The error page that i mention about is in this screenshot:

Purpose

To make it become more user friendly to the users with their own localization, and providing good user experience to the user who want to report/receive information about the error without having a burden need to translate again.

Do you want to implement this feature yourself?

• Yes, I will implement this by myself and send a pull request