Updates to slack connection

[unDemian]

Changes proposed in this Pull Request

Fixes 3748-gh-Automattic/p2 by updating the messages and screenshots that can be seen in Calypso.

Testing instructions

See 3748-gh-Automattic/p2

[github-actions]

Link to Calypso live: https://calypso.live?image=registry.a8c.com/calypso/app:build-16081
Link to Jetpack Cloud live: https://calypso.live?image=registry.a8c.com/calypso/app:build-16081&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~58 bytes added 📈 [gzipped])

name       parsed_size           gzip_size
marketing       +357 B  (+0.1%)      +58 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[lezama]

looking good

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/6722047

Hi @unDemian, could you please edit the description of this PR and add a screenshot for our translators? Ideally it'd include all of the following strings:

• Workspace connected to Slack.
• Connect this workspace to your Slack.
• Get Slack notifications with every new P2 post.
• Get {{strong}}Slack notifications{{/strong}} with every new P2 post.
• Preview posts and pages directly from Slack.
• {{strong}}Preview posts and pages{{/strong}} directly from Slack.

Thank you in advance!

[a8ci18n]

Translation for this Pull Request has now been finished.