Replace _x() with __() and translators comments in wp-includes/post-template.php

[ramiy]

Context function _x() is used to differ two similar strings with different meanings. Translators comments are used to describe %s placeholders.

The attached patch is replacing:

/* translators: post revision title: 1: author avatar, 2: author name, 3: time ago, 4: date */
_x( '%1$s %2$s, %3$s ago (%4$s)', 'post revision title' )

With:

/* translators: post revision title: 1: author avatar, 2: author name, 3: time ago, 4: date */
__( '%1$s %2$s, %3$s ago (%4$s)' )

[SergeyBiryukov]

In 38327:

I18N: Remove unnecessary context in wp_post_revision_title_expanded().

Props ramiy.
Fixes #37781.