update text on loading screen

[roo2]

Changes proposed in this Pull Request

Simply updates the text on the loading screen, and reduce the expected loading time for when HS is run. I may look at adding other improvements in future:

• Change the messages on the loading screen if no design is selected.
• Use specific times for each step to give a feeling of steps taking amounts of time

p1634769393106000-slack-C029SB8JT8S

Testing instructions

Go to the intent screen and select the build flow, select a theme such as twentytwenty which will have a long loading time. Observer that the text has been updated on the loading screen
/start/setup-site/intent?flags=signup/hero-flow&siteSlug=YOUR_SITE.wordpress.com
Related to #

[github-actions]

Link to Calypso live: https://calypso.live?image=registry.a8c.com/calypso/app:commit-e64ab8cc204a36ac0a48e1861e0bc37374e558c4
Link to Jetpack Cloud live: https://calypso.live?image=registry.a8c.com/calypso/app:commit-e64ab8cc204a36ac0a48e1861e0bc37374e558c4&env=jetpack
(These links may take a few minutes to be available)

[matticbot]

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

Sections (~14 bytes added 📈 [gzipped])

name    parsed_size           gzip_size
signup        -21 B  (-0.0%)      +14 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.

[a8ci18n]

ℹ️ String reuse speeds up translation and improves consistency. The following string might make a good alternative and has already been translated 18 times:
translate( 'Enabling SSL encryption' ) ES Score: 8

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/6898106

Hi @roo2, 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:

• Laying the foundations
• Turning on the lights
• Making it beautiful
• Sprinkling some magic
• Securing your data
• Applying a shiny top coat

Thank you in advance!

[a8ci18n]

Translation for this Pull Request has now been finished.