[MC-191579] Book signing GUI has broken formatting for right-to-left languages

The book signing screen of writable books has broken formatting for right-to-left languages because it uses the legacy formatting codes:

The blinking cursor which is supposed to change colour instead shows a "0" and a "7"
The author's name is not gray and instead it shows an "8"

See attached

[media]

Change the language to a right-to-left one, e.g. Arabic (first right-to-left language in the list)
Give yourself a book and quill
```
/give @s writable_book
```
Open the book and click the button for signing it (left button)
→ ❌ The formatting is broken as described above

Attachments

migrated 2020-06-24T14:52:02Z

[media]

j_p_smith 2020-06-24T15:23:01Z

Yes, this is indeed what I was describing. I will be happy to keep it up to date if you like.

marcono1234 2020-06-24T15:55:06Z

Thanks! You are now the reporter and can add affected versions and edit the summary and description.