* Cache failures
* Properly dispose the caches
* Only send requests to trusted domains
* Only embed actual images
* Limit responses to 1MB
* Introduce configuration options for timeout, maximum size and if the
  feature is enabled at all
* Add a UI test that checks that attachment embedding is working in
  general
* Move to httpclient5
* Expose the cookie domains configuration in AuthenticationConfiguration

* Add separate page objects for raw and rendered diff tabs
* Return only a raw changes page object for the extension conflict as it
  doesn't display the full diff UI

  * Add missing dependency of extension-index that contains a migration
    for creating the flavor data

Currently translated at 100.0% (44 of 44 strings)

Translation: XWiki Platform/xwiki-platform-help-ui-movies
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-help-ui-movies/de/

Currently translated at 100.0% (267 of 267 strings)

Translation: XWiki Platform/XWiki Platform - CKEditor - UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-ckeditor-ui/de/

Currently translated at 95.2% (4252 of 4462 strings)

Translation: XWiki Platform/XWiki Core Resources
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-core-resources/pt_BR/

Currently translated at 100.0% (9 of 9 strings)

Translation: XWiki Platform/xwiki-platform-office-macro
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-office-macro/pt_BR/

Currently translated at 100.0% (32 of 32 strings)

Translation: XWiki Platform/Include Macro
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/include-macro/pt_BR/

Currently translated at 100.0% (42 of 42 strings)

Translation: XWiki Platform/Menu Application
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/menu-application/pt_BR/

Currently translated at 100.0% (190 of 190 strings)

Translation: XWiki Platform/AppWithinMinutes.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/appwithinminutes-translations/pt_BR/

Currently translated at 100.0% (15 of 15 strings)

Translation: XWiki Platform/Help.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/help-translations/pt_BR/

Currently translated at 100.0% (12 of 12 strings)

Translation: XWiki Platform/Index.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/index-translations/pt_BR/

Currently translated at 91.2% (4070 of 4462 strings)

Translation: XWiki Platform/XWiki Core Resources
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-core-resources/pt_BR/

Currently translated at 100.0% (179 of 179 strings)

Translation: XWiki Platform/Main WikiManager.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/main-wikimanager-translations/pt_BR/

Currently translated at 100.0% (12 of 12 strings)

Translation: XWiki Platform/Index.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/index-translations/pt/

Currently translated at 100.0% (179 of 179 strings)

Translation: XWiki Platform/Main WikiManager.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/main-wikimanager-translations/pt_BR/

Currently translated at 39.7% (1775 of 4462 strings)

Translation: XWiki Platform/XWiki Core Resources
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-core-resources/pt/

* Changes to the status of the WCAG rules that are currently not violated. From this point on, all changed rules will make the build fail.

As of https://ci.xwiki.org/job/XWiki%20Environment%20Tests/job/xwiki-platform/job/master/299/, there are only a few rules that fail through tests:
- aria-allowed-attr 5 violations
- aria-required-children 65 violations
- label 63 violations
- duplicate-id 6 violations
- duplicate-id-active 3 violations
- duplicate-id-aria 8 violations
- image-alt 51 violations
- link-in-text-block 328 violations
- select-name 16 violations
- color-contrast 83 violations
- scrollable-region-focusable 1 violation

Total violations: 629

* frame-title fixed by https://jira.xwiki.org/browse/XWIKI-20973
* link-name fixed

  * Fix integration test on chrome

Currently translated at 100.0% (3 of 3 strings)

Translation: XWiki Platform/Extension - Security - Notifications
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/extension-security-notifications/ru/

Currently translated at 100.0% (1 of 1 strings)

Translation: XWiki Platform/xwiki-platform-statistics-ui
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-statistics-ui/ru/

Currently translated at 100.0% (6 of 6 strings)

Translation: XWiki Platform/xwiki-platform-release-ui
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-release-ui/ru/

Currently translated at 100.0% (2 of 2 strings)

Translation: XWiki Platform/xwiki-platform-whatsnew-ui
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-whatsnew-ui/ru/

Currently translated at 100.0% (55 of 55 strings)

Translation: XWiki Platform/xwiki-platform-xclass-ui
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-xclass-ui/de/

Currently translated at 100.0% (36 of 36 strings)

Translation: XWiki Platform/xwiki-platform-help-ui-contributors
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-help-ui-contributors/de/

Currently translated at 100.0% (2 of 2 strings)

Translation: XWiki Platform/XWiki.XWikiSyntaxHeadings
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-xwikisyntaxheadings/ru/

Currently translated at 100.0% (264 of 264 strings)

Translation: XWiki Platform/XWiki Platform - CKEditor - UI
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-platform-ckeditor-ui/ru/

Currently translated at 100.0% (180 of 180 strings)

Translation: XWiki Platform/XWiki.Notifications.Code.Translations
Translate-URL: https://l10n.xwiki.org/projects/xwiki-platform/xwiki-notifications-code-translations/ru/