Some of the msgid messages in the wordpress.pot file contains inline comments for the translator. These comments should ideally form part of the commented section of each message. Leaving the comments inline might cause translators to translate the comment if they use a tool that doesn't know to hide these comments from the user.
In the wordpress.pot file, these comments are separated from the translatable text using a pipe character.
Examples of what currently is and what should ideally be:
==
#: wp-admin/edit-comments.php:99
msgid "Approved|plural"
msgstr ""
#: wp-admin/edit-comments.php:99
msgctxt "plural"
msgid "Approved"
msgstr ""
==
#: wp-admin/edit-pages.php:42 wp-admin/includes/post.php:481
msgid "Drafts|manage posts header"
msgstr ""
#: wp-admin/edit-pages.php:42 wp-admin/includes/post.php:481
msgctxt "manage posts header"
msgid "Drafts"
msgstr ""
==
#: wp-admin/edit-pages.php:74
#, php-format
msgid ""
"%1$s%2$s%3$s|You can reorder these: 1: Pages, 2: by {s}, 3: matching {s}"
msgstr ""
#: wp-admin/edit-pages.php:74
#, php-format
msgctxt ""
"You can reorder these: 1: Pages, 2: by {s}, 3: matching {s}"
msgid "%1$s%2$s%3$s"
msgstr ""
==
You can easily find these in the wordpress.pot file by searching for a pipe (|) character, but I've extracted all of them from wordpress.pot, to illustrate which of them need the change. Some of them might use comprehensive rewriting, such as this one:
#: wp-includes/locale.php:186
msgid ""
"number_format_decimal_point|$dec_point argument for http://php.net/"
"number_format, default is ."
msgstr ""
...which is probably rather meanless to a poor translator. I'll be willing to write suggested changes for these, but I'm not skilled to edit the actual sources from which the POT file is generated.
Thanks