[docs] Fix broken links and typos (#4418)

# Description

Fix links and typos in docs and settings page:

* Fix https://codeberg.org/superseriousbusiness/gotosocial/issues/4328
* Fix https://codeberg.org/superseriousbusiness/gotosocial/issues/4360

Also fix broken issuetracker links as forgejo does not support search
queries like "label:bug"

The translation for Zh-cn still says "this project" according to google
translate, I only fixed the link.

## Checklist

Please put an x inside each checkbox to indicate that you've read and followed it: `[ ]` -> `[x]`

If this is a documentation change, only the first checkbox must be filled (you can delete the others if you want).

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [ ] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [ ] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [ ] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4418
Co-authored-by: Markus Unterwaditzer <markus-tarpit+git@unterwaditzer.net>
Co-committed-by: Markus Unterwaditzer <markus-tarpit+git@unterwaditzer.net>

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