Avoid using HTML tags in translation strings (network documentation links)

[ramiy]

The documentation links in help tabs are translatable. But the translation strings contain the HTML <a> tags with the links.

The attached patch fixes this, moving the HTML tag out of the translation string.

In this ticket I've started with the ​network documentation links. If the ticket will be approved, I'll fix documentation links in other help tabs.

This ticket is a part of my core i18n improvements project.

[ocean90]

The codex links should be still translatable.

[ramiy]

I can replace:

esc_url( 'https://codex.wordpress.org/Tools_Network_Screen' )

With:

esc_url( __( 'https://codex.wordpress.org/Tools_Network_Screen' ) )

[ramiy]

I can also do that with sprintf() for documentation strings:

sprintf(
	'<a href="%1$s" target="_blank">%2$s</a>'
	__( 'https://codex.wordpress.org/XXX' ),
	__( 'Documentation on XXX' ),
)

[ocean90]

Closing as wontfix as per ​https://wordpress.slack.com/archives/core-i18n/p1467746297000038.