Attributes in block.json files are not translated

[imath]

Here's the list of blocks to check:

• Latests activities (title attribute)
• Recent Networkwide Posts (title attribute)
• Dynamic Groups List (title attribute)
• Recently Active Members (title attribute)
• Dynamic Members List (title attribute)
• Online Members (title attribute)

1) Fix the Latest Activities block:

• Avoid a React Error removing the code used to set the postId attribute. We now use specific attributes for the ServerSideRender component.
• Fix a regressions introduced by ​r13537 that was preventing the usage of the activity/widget template when BP Nouveau is the active template pack.
• Fix a misusage of wp_list_pluck() preventing activity types to be fetched for the block.

2) For BP Blocks using a title attributes, make sure the default one can be translated.

• Latest Activities block,
• Recent Networkwide Posts
• Dynamic Groups List
• Recently Active Members
• Dynamic Members List
• Online Members

Trac ticket: ​https://buddypress.trac.wordpress.org/ticket/9074

Wow, the way this works is very counterintuitive.

The main problem was with the Latest Activities block, something that used to work previously (setting the postId attribute once the block is added to a post) is now generating an error preventing the Activity Types select box to appear etc.. So I had to use a workaround 😓 .

I noticed it while working on a way to have the default Blocks title translated. Using Block attributes in the block.json file was a wrong idea. Title, description are translated but not attributes.

[imath]

In 13716:

BP Blocks: make sure default block titles can be translated

Some of the BP Blocks are using a title attribute into their block.json. Unfortunately, block attributes do not seem to be include in the translatable strings of the WP Block Metadata API.

To fix this, all block.json title attributes now default to an empty string & the default title value is handled within the PHP callback to render the block.

For the specific case of the Latest Activities block, this commit also fixes some errors that were preventing it to be able to select the list of Activity types to include into the rendered activities.

See #9074 (trunk)
Closes ​https://github.com/buddypress/buddypress/pull/223

[imath]

In 13717:

BP Blocks: make sure default block titles can be translated

Some of the BP Blocks are using a title attribute into their block.json. Unfortunately, block attributes do not seem to be include in the translatable strings of the WP Block Metadata API.

To fix this, all block.json title attributes now default to an empty string & the default title value is handled within the PHP callback to render the block.

For the specific case of the Latest Activities block, this commit also fixes some errors that were preventing it to be able to select the list of Activity types to include into the rendered activities.

Fixes #9074 (branch 12.0)