Twenty Thirteen: Replaces ellipses with ellipses and a Continue reading link.

[davidakennedy]

To help improve accessibility, we need to make clean automatically-generated excepts and excerpts handle the post title. This makes the Continue reading links more specific for screen reader users.

We should replace the ellipses (appended to automatically generated excerpts) with a Continue reading link.

We can also add a visually hidden post title in the content template parts to better accommodate screen reader users.

Something like:

<?php
    /* translators: %s: Name of current post */
    the_content( sprintf(
        esc_html__( 'Continue reading %s', 'twentyfifteen' ),
            the_title( '<span class="screen-reader-text">', '</span>', false )
        ) );
?>

Related: #30135, #30176

[davidakennedy]

Removes leading space; concatenates ellipses with spaces and link.

[michaelbeil]

did some testing on this patch. works well.

[lancewillett]

Let's try to get this in soon to coincide with updating all default themes for 4.1.

[lancewillett]

I adjusted the doc block and function comments a tiny bit, similar to r30389 for Twenty Fourteen.

[lancewillett]

In 30390:

Twenty Thirteen: replace ellipses appended to automatically generated excerpts with both ellipses and a "Continue Reading" link to meet accessibility-ready requirements.

Props davidakennedy, lancewillett. Fixes #30178.