Registered braille codes would benefit from more elaborate explanation / metadata about metadata

The explanation of the [registered braille codes](https://daisy.github.io/ebraille/registries/codes/#registered-codes) is currently limited to one short string, derived from the "index-name" metadata of the corresponding Liblouis translation tables. For example:

- braille code: `NABCC no-grade comp8`
- index-name metadata of corresponding Liblouis table: "English, U.S., computer, NABCC"

(Note that the purpose of the index-name metadata is to be used within a table selection form, e.g. a dropdown list. The strings are brief and make for a clear list when sorted alphabetically.)

It would be good if we could use a more descriptive string, and possibly add more metadata. For example:

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NABCC no-grade comp8

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North American Braille Computer Code

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Locale:
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• en-US

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8-dot system

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Authority: ICEB

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Related codes:
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• CBC 6dot no-grade comp6 (English 6-dot computer braille as used in the U.S.)

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• CBC 8dot no-grade comp8 (English 8-dot computer braille as used in the U.S.)

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• CBC no-grade comp8 (English computer braille as used in Canada)

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• SEB no-grade comp8 (English computer braille as used in the U.K.)

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