Commit Graph

40431 Commits

Author SHA1 Message Date
John Blackbourn
235373d4d7 Pings/Trackbacks: Avoid adding multiple _pingme and _encloseme meta entries to a post when it gets updated prior to pings being done.
Props rebasaurus, whyisjake

Fixes #48014

Built from https://develop.svn.wordpress.org/trunk@46426


git-svn-id: http://core.svn.wordpress.org/trunk@46224 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 20:29:04 +00:00
Andrea Fercia
92f09c0496 Accessibility: Improve and modernize user interface controls: Revert the new links focus style.
Thew new dotted outline for the links focus style introduced in [46241] doesn't appear to be ready to guarantee a good indication of focus.
It was agreed to restore the previous links focus style and postpone exploration for a new style to the next release cycle.
Partially reverts [46241] and [46293].

See #34904, #47153.

Built from https://develop.svn.wordpress.org/trunk@46425


git-svn-id: http://core.svn.wordpress.org/trunk@46223 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 19:57:02 +00:00
John Blackbourn
2f46afbc53 Docs: Miscellaneous inline docs corrections and improvements.
See #47110 

Built from https://develop.svn.wordpress.org/trunk@46424


git-svn-id: http://core.svn.wordpress.org/trunk@46222 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 19:08:06 +00:00
Andrea Fercia
3a27f92158 Accessibility: Improve and modernize user interface controls: Improve the buttons active CSS class.
- improves the buttons `.active` CSS class for buttons that need to be styled as "pressed"
- update the alternate color schemes `.active` CSS class accordingly
- improves a few icons colors in the alternate color schemes

See #34904.

Built from https://develop.svn.wordpress.org/trunk@46423


git-svn-id: http://core.svn.wordpress.org/trunk@46221 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 18:47:05 +00:00
Andrew Ozz
67b2ff7bc3 REST API: Add support for continuing the post-processing of images after upload. Flow:
1. `POST /wp/v2/media`.
2. If the upload failed (HTTP 500 error), look for a response header with `X-WP-Upload-Attachment-ID` header that contains the newly created attachment ID.
3. `POST /wp/v2/media/{id}/post-process` with `{ "action": "create-image-subsizes" }`. This request may still fail, but it will save its progress.
4. On continued failure, `DELETE /wp/v2/media/{id}` to give up on the upload and instruct the user to resize their image before uploading.

Props TimothyBlynJacobs.
Fixes #47987.
Built from https://develop.svn.wordpress.org/trunk@46422


git-svn-id: http://core.svn.wordpress.org/trunk@46220 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 17:06:03 +00:00
Andrew Ozz
f793398e4f Upload: Set custom header with the attachment ID for all uploads from media_handle_upload(). Let the REST API endpoint set it separately.
Props timothyblynjacobs.
Fixes #48200.
Built from https://develop.svn.wordpress.org/trunk@46421


git-svn-id: http://core.svn.wordpress.org/trunk@46219 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 15:30:02 +00:00
Sergey Biryukov
cce502be78 Coding Standards: Fix WPCS issues in wp-includes/ms-deprecated.php.
Props itowhid06.
Fixes #48237.
Built from https://develop.svn.wordpress.org/trunk@46420


git-svn-id: http://core.svn.wordpress.org/trunk@46218 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 15:18:03 +00:00
Andrea Fercia
e9065659f4 Accessibility: Improve and modernize user interface controls for better contrast: Further improvements to input heights and alignments.
- improves input fields height in the customizer
- improves input fields height for Internet Explorer 11
- improves input fields height in the Image Editor
- improves alignment of selects and buttons in the privacy policy pages
- makes the search themes fields font-size consistent

Props garrett-eclipse, afercia.
See #47477.

Built from https://develop.svn.wordpress.org/trunk@46419


git-svn-id: http://core.svn.wordpress.org/trunk@46217 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 13:20:03 +00:00
Andrea Fercia
1f3d583825 Accessibility: Media: Improve the search media field labelling.
Visible `<label>` elements benefit all users. The `placeholder` attribute should not be used as a replacement for visible labels.
Instead, it's supposed to be used only for a short hint to aid users with data entry e.g. a sample value or a brief description of the expected format.

Screen readers may not announce a `placeholder` attribute at all. Other users may suffer from the lack of a visible label and a placeholder used as replacement, for example:

- users with cognitive disabilities may have trouble remembering what the filled field does
- speech recognition users cannot see the name they can speak to set focus on the field
- low-vision users with high text-size may not be able to see the whole placeholder even when it's visible, if its value is clipped by the edge of the input

Props anevins, audrasjb, karmatosed, azaozz, SergeyBiryukov, afercia.
See #40331.
Fixes #47138.

Built from https://develop.svn.wordpress.org/trunk@46418


git-svn-id: http://core.svn.wordpress.org/trunk@46216 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 12:43:03 +00:00
Andrea Fercia
51814d68af Accessibility: Login and Registration: Improve the invalid username and invalid email messages.
- explicitly informs users they can use their email to log in as an alternative to their username and vice-versa
- shows the `Lost your password?` link only when an wrong password has been entered
- uses a more appropriate copy by changing "invalid" to "unknown"
- removes the all caps `ERROR`

Props subrataemfluence, zalak151291, ryokuhi, SergeyBiryukov, audrasjb, joedolson, marybaum, ramiy, markjaquith, chanthaboune, afercia.
Fixes #43037.

Built from https://develop.svn.wordpress.org/trunk@46417


git-svn-id: http://core.svn.wordpress.org/trunk@46215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-07 11:54:05 +00:00
Aaron Jorbin
0ea646a185 External Libraries: Fix PHP 7.4 compatibility issue in the Requests library.
Moves https://github.com/rmccue/Requests/pull/370 into WordPress.

Previous [46258].

See #47746.

Built from https://develop.svn.wordpress.org/trunk@46416


git-svn-id: http://core.svn.wordpress.org/trunk@46214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 17:14:02 +00:00
Sergey Biryukov
406dc81ebc Coding Standards: Fix WPCS issues in WP_Widget_Links and WP_Widget_Pages.
Props itowhid06.
Fixes #48228.
Built from https://develop.svn.wordpress.org/trunk@46415


git-svn-id: http://core.svn.wordpress.org/trunk@46213 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 15:28:03 +00:00
Sergey Biryukov
d54df2ffb3 Tests: Use a consistent group for nav menu tests.
Fixes #48230.
Built from https://develop.svn.wordpress.org/trunk@46414


git-svn-id: http://core.svn.wordpress.org/trunk@46212 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 15:14:03 +00:00
Sergey Biryukov
8252125175 Menus: In Walker_Nav_Menu, Walker_Category, and Walker_Page, properly output link attributes having a legitimate "empty" value, for example an HTML data attribute with a value of zero (0).
Props nevma, AkSDvP, greenshady, SergeyBiryukov.
Fixes #47720.
Built from https://develop.svn.wordpress.org/trunk@46413


git-svn-id: http://core.svn.wordpress.org/trunk@46211 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 15:06:03 +00:00
whyisjake
ea5d76fbb2 Privacy: Ensure that sending email, and remove data follow the same user experience.
Both personal data request processes should follow the same convention.

Fixes: #43974.
Props: garrett-eclipse, kjellr, Kerfred, birgire, marybaum, SergeyBiryukov.



Built from https://develop.svn.wordpress.org/trunk@46412


git-svn-id: http://core.svn.wordpress.org/trunk@46210 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 06:56:02 +00:00
whyisjake
4269998771 Administration: Add a max-width to the Privacy Policy Page dropdown.
If there's a page with an extra long title, the Privacy Policy page dropdown in Privacy Settings overflows the page width.

Fixes #47366
Props garrett-eclipse, SergeyBiryukov, mukesh27, desrosj, adhitya03, jalpa1984, nrqsnchz, paresh07.

Built from https://develop.svn.wordpress.org/trunk@46411


git-svn-id: http://core.svn.wordpress.org/trunk@46209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 06:42:02 +00:00
Sergey Biryukov
554b60da76 Docs: Format comments in wp-admin/includes/plugin.php as per the documentation standards.
Props dkarfa.
Fixes #48191.
Built from https://develop.svn.wordpress.org/trunk@46410


git-svn-id: http://core.svn.wordpress.org/trunk@46208 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-06 02:23:03 +00:00
Aaron Jorbin
ebd841790b Build/Test: Update Grunt Uglify options
Follow up to [46408]

Sometimes you need to take documentation literally. And sometimes you need to take it seriously. Deprecations and replacements in uglify are a case where I took them literally and should have taken them seriously.

See #48203.


Built from https://develop.svn.wordpress.org/trunk@46409


git-svn-id: http://core.svn.wordpress.org/trunk@46207 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 22:01:04 +00:00
Aaron Jorbin
0e21d32900 Build/Test: Bump devDependencies for WordPress 5.3
This upgrades a number of devDependencies.  Some of these include changes to how the tasks are configured.

Uglify: There are deprecated options from 2.x to 4.x, see: https://github.com/gruntjs/grunt-contrib-uglify#options

Autoprefixer: Browserslist now warns when passing in the browser list, so that is put into package.json

As with most changes to uglify, this changes every minified JS file.

Fixes #48203.



Built from https://develop.svn.wordpress.org/trunk@46408


git-svn-id: http://core.svn.wordpress.org/trunk@46206 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 19:49:10 +00:00
Sergey Biryukov
3520f5234b Taxonomy: Prevent Parent Category dropdown and field descriptions on Categories and Edit Category screens from extending beyond the other fields.
Props garrett-eclipse, dkarfa.
Fixes #48188.
Built from https://develop.svn.wordpress.org/trunk@46405


git-svn-id: http://core.svn.wordpress.org/trunk@46204 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 15:41:57 +00:00
Aaron Jorbin
a92b23ee61 Build/Test tools: Update grunt-contrib-imagemin and run it
Smaller images are good, so is not having npm vulnerabilities.

See #48203.
Fixes #48206.
Props whyisjake, netweb.


Built from https://develop.svn.wordpress.org/trunk@46404


git-svn-id: http://core.svn.wordpress.org/trunk@46203 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 14:20:59 +00:00
Aaron Jorbin
9bc996b193 Build/Test Tools: Fork and Update grunt-replace
The version of grunt replace that is bundled in core is using an outdated version of lodash that is bringing 2 low, 3 high, and 1 critical issue. This package is currently abandoned. There is a community forked version, but that is also harboring some similar security issues.

This switches to a fork by @whyisjake and causes no change to the build.

See #48203.
Fixes #48217.
Props whyisjake, netweb for testing.


Built from https://develop.svn.wordpress.org/trunk@46403


git-svn-id: http://core.svn.wordpress.org/trunk@46202 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 13:49:00 +00:00
Sergey Biryukov
f1b5f2aa94 Site Health: Improve the wording for UTF8MB4 test description.
Props garrett-eclipse, chetan200891, johnjamesjacoby, ayeshrajans.
Fixes #48044.
Built from https://develop.svn.wordpress.org/trunk@46402


git-svn-id: http://core.svn.wordpress.org/trunk@46201 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 02:39:58 +00:00
Sergey Biryukov
2237306c2b Customize: Remove duplicate attr_title assignment in api.Menus.MenuItemControl.renderContent().
See #47838.
Built from https://develop.svn.wordpress.org/trunk@46401


git-svn-id: http://core.svn.wordpress.org/trunk@46200 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 02:32:58 +00:00
Sergey Biryukov
f19ecd19de Filesystem API: Use strict type check in the in_array() call for the $skip_list parameter in copy_dir() and _copy_dir().
This ensures that parent folders with a numeric name are not accidentally skipped when only a subfolder is intended to be skipped.

Props codex-m.
Fixes #46581.
Built from https://develop.svn.wordpress.org/trunk@46400


git-svn-id: http://core.svn.wordpress.org/trunk@46199 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 02:16:56 +00:00
Sergey Biryukov
30913bc9a2 Docs: Correct formatting of the @return value description in _wp_handle_upload().
See #47110.
Built from https://develop.svn.wordpress.org/trunk@46399


git-svn-id: http://core.svn.wordpress.org/trunk@46198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 02:09:57 +00:00
Sergey Biryukov
60617d471b Docs: Add missing documentation for the first parameter of the big_image_size_threshold filter.
Props dkarfa, desrosj, earnjam.
Fixes #48214.
Built from https://develop.svn.wordpress.org/trunk@46398


git-svn-id: http://core.svn.wordpress.org/trunk@46197 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 01:30:58 +00:00
Sergey Biryukov
c656e778bf Emoji: Revert [46393] pending test failure investigation.
See #46537.
Built from https://develop.svn.wordpress.org/trunk@46397


git-svn-id: http://core.svn.wordpress.org/trunk@46196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 01:01:00 +00:00
Sergey Biryukov
f1e54593f0 Comments: Remove a one-time variable in wp_rel_nofollow() and wp_rel_ugc().
See #48022.
Built from https://develop.svn.wordpress.org/trunk@46396


git-svn-id: http://core.svn.wordpress.org/trunk@46195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 00:56:57 +00:00
Sergey Biryukov
83edc24762 Themes: In get_theme_mod(), only run the sprintf() replacement on the default value if there's a string format pattern found in the value.
This prevents standalone percent symbols from being stripped out, e.g. in a default value like `100%`.

Props aristath, kuus, moonomo, westonruter, davetgreen, daviedR, katielgc, noisysocks, SergeyBiryukov.
Fixes #34290.
Built from https://develop.svn.wordpress.org/trunk@46395


git-svn-id: http://core.svn.wordpress.org/trunk@46194 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 00:54:58 +00:00
Sergey Biryukov
5fd25a6944 Docs: Improve documentation for get_theme_mod() and set_theme_mod().
See #47110.
Built from https://develop.svn.wordpress.org/trunk@46394


git-svn-id: http://core.svn.wordpress.org/trunk@46193 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-05 00:40:58 +00:00
Sergey Biryukov
538e0d4fb3 Emoji: Stop emoji replacement from happening inside CodeMirror instances, and clean up some logic in the MutationObserver.
Props pento, hirofumi2012, davidbaumwald.
Fixes #46537.
Built from https://develop.svn.wordpress.org/trunk@46393


git-svn-id: http://core.svn.wordpress.org/trunk@46192 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 23:29:59 +00:00
Sergey Biryukov
5241f4c2dd Themes: Bring default values for get_theme_root(), get_theme_root_uri(), wp_get_theme(), and wp_customize_url() in line with the documentation.
Reverts [46327].

Fixes #44397.
Built from https://develop.svn.wordpress.org/trunk@46392


git-svn-id: http://core.svn.wordpress.org/trunk@46191 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 23:20:58 +00:00
Sergey Biryukov
d2a48496d2 Docs: Add missing description for $comment global.
Props immeet94, mukesh27.
Fixes #46928. See #47110.
Built from https://develop.svn.wordpress.org/trunk@46391


git-svn-id: http://core.svn.wordpress.org/trunk@46190 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 22:19:57 +00:00
Sergey Biryukov
f34db2aa7e I18N: Add missing comma in a translator comment.
See #47515.
Built from https://develop.svn.wordpress.org/trunk@46390


git-svn-id: http://core.svn.wordpress.org/trunk@46189 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 22:09:57 +00:00
Dominik Schilling
eaf4dba2f4 Customize: Prevent breaking the customizer when site title contains templating syntax.
When the site title is inside an underscore template, syntax defined in `wp.template` like `{{ }}` is treated as special characters and will make Underscore treat it as data to be compiled/rendered.

Props pierlo, donmhico.
Fixes #46863.
Built from https://develop.svn.wordpress.org/trunk@46389


git-svn-id: http://core.svn.wordpress.org/trunk@46188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 21:59:57 +00:00
Dominik Schilling
b64e8b33fc QUnit: Include script dependencies for wp-a11y script to fix a TypeError.
Also, add missing message argument to Customizer notifications to ensure tests are passing.

Fixes #45066.
Built from https://develop.svn.wordpress.org/trunk@46388


git-svn-id: http://core.svn.wordpress.org/trunk@46187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 21:20:58 +00:00
Dominik Schilling
d38d1c2c35 I18N: Fix translator comment for a themes list table string with numbered placeholders.
Props garrett-eclipse.
Fixes #47515.
Built from https://develop.svn.wordpress.org/trunk@46387


git-svn-id: http://core.svn.wordpress.org/trunk@46186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 20:20:58 +00:00
Dominik Schilling
6f38c7fb81 Docs: Convert 'Block Editor' to lowercase.
Props garrett-eclipse.
Fixes #45634.
Built from https://develop.svn.wordpress.org/trunk@46386


git-svn-id: http://core.svn.wordpress.org/trunk@46185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 20:12:58 +00:00
Dominik Schilling
cd6110782e Networks and Sites: Improve newly added strings for i18n.
* Remove unnecessary numbered placeholders.
* Add context to "All" and "Spam" status.
* Add translator comments.

Props pedromendonca.
Fixes #48210.
Built from https://develop.svn.wordpress.org/trunk@46385


git-svn-id: http://core.svn.wordpress.org/trunk@46184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 19:58:55 +00:00
desrosj
143b5fd080 Networks and Sites: Fix issues processing additional fields displayed for the Sites list table.
This prevents a `The link you followed has expired.` error when using a filter and now uses `$_POST` instead of `$_GET` to capture all form values.

Props pbiron.
Fixes #45954.
Built from https://develop.svn.wordpress.org/trunk@46384


git-svn-id: http://core.svn.wordpress.org/trunk@46183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-04 14:32:56 +00:00
Sergey Biryukov
c0bb073ca2 Docs: Clarify default value for the $link parameter in edit_tag_link(), edit_term_link(), and edit_bookmark_link().
Props atachibana.
Fixes #48109.
Built from https://develop.svn.wordpress.org/trunk@46383


git-svn-id: http://core.svn.wordpress.org/trunk@46182 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 23:12:57 +00:00
Andrew Ozz
ff225c8bfc Upload: Fix the method used to create image sub-sizes when uploading fails with a PHP fatal error. Use a custom header to send the new attachment post ID even in HTTP 500 responses instead of an upload reference sent by the client. Also add another cap check and remove the action when deleting an attachment post during a failed upload cleanup.
Props timothyblynjacobs, clorith, azaozz.
Fixes #48200.
Built from https://develop.svn.wordpress.org/trunk@46382


git-svn-id: http://core.svn.wordpress.org/trunk@46181 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 21:02:00 +00:00
desrosj
efa9da7446 Docs: Fix code example for removing internal pointers.
Props daleharrison, swissspidy, garrett-eclipse, luciano-croce, jrf, desrosj.
Fixes #45529.
Built from https://develop.svn.wordpress.org/trunk@46381


git-svn-id: http://core.svn.wordpress.org/trunk@46180 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 20:39:58 +00:00
desrosj
6a0f3ddae3 Menus: Fix typo in the class attribute for the hidden title field in Walker_Nav_Menu_Checklist.
Each item that `Walker_Nav_Menu_Checklist` displays is accompanied by several hidden `<input/>` fields that specify default values for each item when added to a menu. These values are passed in JavaScript to the AJAX call triggered when an item is added to a menu.

The hidden field for the title attribute field incorrectly had an underscore instead of a hyphen. Because of this, it was impossible to supply a default value for the Title Attribute field of a nav menu item.

Props yanngarcia, davidbaumwald.
See #47838.
Built from https://develop.svn.wordpress.org/trunk@46380


git-svn-id: http://core.svn.wordpress.org/trunk@46179 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 20:03:56 +00:00
Joe McGill
d89be1ff55 Media: Ensure medialement scripts are loaded in the footer.
This fixes a regression in [41877] which caused `mediaelement` scripts to load in the header.

Props Themezly.
Fixes #44484.

Built from https://develop.svn.wordpress.org/trunk@46379


git-svn-id: http://core.svn.wordpress.org/trunk@46178 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 16:06:59 +00:00
desrosj
b763447019 General: Patch PHMailer for PHP 7.4 compatibility.
This patches the PHPMailer library in Core to be PHP 7.4 compatible by adding a version check before calling `get_magic_quotes_runtime()`.

Props ayeshrajans, jrf.
See #47783.
Built from https://develop.svn.wordpress.org/trunk@46378


git-svn-id: http://core.svn.wordpress.org/trunk@46177 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 15:45:59 +00:00
desrosj
6fa7f757d4 Docs: Add missing @deprecated tags.
Follow up to [46205-46206,46208].

Props jrf.
See #47699.
Built from https://develop.svn.wordpress.org/trunk@46377


git-svn-id: http://core.svn.wordpress.org/trunk@46176 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 14:48:55 +00:00
Joe McGill
ecf00fc844 Media: Improve documentation for add_image_size()
This improves the description of the `$crop` parameter to clarify behavior.

Props nikolastoqnow, ketuchetan, audrasjb, killua99, pierlo.
Fixes #42463.


Built from https://develop.svn.wordpress.org/trunk@46376


git-svn-id: http://core.svn.wordpress.org/trunk@46175 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 14:47:59 +00:00
Andrea Fercia
b1cd71c2d2 Accessibility: Media: Add more headings in the Media Modal.
Headings are the predominant mechanism for screen reader users to find information in a page. They also help all users to better identify the main sections of user interfaces.

- adds three new headings within the media modal 
- improves plural form translation for "item selected" by using `wp.i18n`
- horizontally centers the media modal menu in the responsive view

Props kjellr, karmatosed, melchoyce, afercia.
See #47149.
Fixes #47610.

Built from https://develop.svn.wordpress.org/trunk@46375


git-svn-id: http://core.svn.wordpress.org/trunk@46174 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-10-03 12:10:57 +00:00