Add copy button when creating new application password Fix/62019

[circlecube]

Trac ticket: https://core.trac.wordpress.org/ticket/62019

Updating the existing patch to capitalize the button text 'copy > 'Copy' and making the text translatable.

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Props circlecube, jeremyfelt.

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[jeremyfelt]

Things are looking good so far, @circlecube, thanks!

A couple more notes:

1. We should apply these changes to wp-admin/profile.php as well. I think folks are more likely to be adding application passwords through that screen rather than while editing another user.
2. We can probably add a bit of spacing above "Copy" on mobile. (See screenshot)

[circlecube]

1. We should apply these changes to wp-admin/profile.php as well. I think folks are more likely to be adding application passwords through that screen rather than while editing another user.

The wp-admin/profile.php file loads up wp-admin/user-edit/php i.e. these changes are on the profile page now.

2. We can probably add a bit of spacing above "Copy" on mobile.

Good catch @jeremyfelt, looking at this now.

[jeremyfelt]

The wp-admin/profile.php file loads up wp-admin/user-edit/php i.e. these changes are on the profile page now.

Ha! I swear this was not working, but there it is. My fault!

[circlecube]

Screenshots of the mobile layout with a tiny CSS tweak: