Use inclusive language when submitting plugin for review

[sean212]

Currently the language is using "whitelist" versus a more inclusive "allowlist" when a plugin is submitted for review.

Ensure that the success message after submitting a plugin includes inclusive language.

Fixes https://meta.trac.wordpress.org/ticket/6540

[dd32]

Rather than using allowlist perhaps we could use the more english wording of safe sender list? Or just something like Please make sure to add email address to your never-send-to-spam list.

I think Outlook uses "safe sender", and both Gmail and Yahoo don't have such a list, but rather have an option for "never send this sender to spam" the ability to create a filter that never sends to spam.

[Ipstenu]

We could probably simplify it even more...

			__( 'We’ve sent you an email verifying this submission. Make sure you set all emails from wordpress.org to never go to spam (i.e. via email filters or approval lists). That will ensure you won't miss any of our messages.' ),

[dd32]

In 12163:

Plugin Directory: Use more inclusive language post-plugin-submission, hopefully ensuring all plugin authors get all WordPress.org emails.

Props Ipstenu, sean212.
Closes ​https://github.com/WordPress/wordpress.org/pull/97.
Fixes #6540.