Editor: Update default block categories

[aduth]

Related: ​https://github.com/WordPress/gutenberg/pull/19279

Background:

In ​GB#19279 (issue ​GB11406), the default set of block categories was updated.

The new set of block categories are:

• Text
• Media
• Design
• Widgets
• Embeds
• Reusable

Of the above, a few have remained unchanged: Widgets, Embeds, Reusable.

Mappings have been added to ensure that existing blocks will be assigned to as close as possible to an equivalent category in the new set:

• Common → Text
• Formatting → Text
• Layout → Design

Task:

The default set of block categories implemented in Core PHP should be updated to correspond to these revisions.

This array:

​https://github.com/WordPress/wordpress-develop/blob/5.4.1/src/wp-admin/includes/post.php#L2167-L2196

[aduth]

Open question: Should translator context or comment be provided for any of these new strings?

e.g. disambiguate as label of block category? Disambiguate "Text" or "Design" as verb vs. noun.

​https://developer.wordpress.org/apis/handbook/internationalization/internationalization-guidelines/#disambiguation-by-context

There was none previously.

[ocean90]

Should translator context or comment be provided for any of these new strings?

Yes, block category would be enough.

[gziolo]

This is good to go after i18n part gets updated. We should merge is just before #50420 because otherwise the majority blocks won't be exposed in the inserter. With WordPress 5.5, the category name won't be mandatory anymore.

[gziolo]

Translation context added

[gziolo]

Thanks @ocean90, I updated the patch to include translation context.

[ellatrix]

In 48119:

Editor: Update default block categories

See ​https://github.com/WordPress/gutenberg/pull/19279.

Props aduth, gziolo.
Fixes #50278.

[noisysocks]

In 48130:

Editor: Revert [48119].

This commit caused the majority of blocks in the block editor to no longer
register as they reference the old category names.

See #50278.

[noisysocks]

I reverted 48119 as it caused most blocks to throw an 'Unknown category' error when loading the block editor in trunk without the Gutenberg plugin activated. This made the block editor unusable in trunk and in Make/Core.

We'll need to commit this at the same time that packages are updated so that there aren't calls to registerBlockType() which use the old category.

[ellatrix]

In 48177:

Editor: update JavaScript packages

Also update default block categories

Props youknowriad, gziolo, aduth.
Fixes #50420, #50278.

[justinahinon]

Dev note link: ​https://make.wordpress.org/core/2020/07/30/block-api-updates-in-5-5/