Merge "Introduce MessageLocalizer interface for exposing msg() method"

diff --combined autoload.php
index 6c5aff5,bfe1cd5..2715655
--- 1/autoload.php
--- 2/autoload.php
+++ b/autoload.php
@@@ -979,6 -979,7 +979,7 @@@ $wgAutoloadLocalClasses = 
        'MessageBlobStore' => __DIR__ . '/includes/cache/MessageBlobStore.php',
        'MessageCache' => __DIR__ . '/includes/cache/MessageCache.php',
        'MessageContent' => __DIR__ . '/includes/content/MessageContent.php',
+       'MessageLocalizer' => __DIR__ . '/languages/MessageLocalizer.php',
        'MessageSpecifier' => __DIR__ . '/includes/libs/MessageSpecifier.php',
        'MigrateFileRepoLayout' => __DIR__ . '/maintenance/migrateFileRepoLayout.php',
        'MigrateUserGroup' => __DIR__ . '/maintenance/migrateUserGroup.php',
@@@ -1070,7 -1071,6 +1071,7 @@@
        'PackedOverlayImageGallery' => __DIR__ . '/includes/gallery/PackedOverlayImageGallery.php',
        'Page' => __DIR__ . '/includes/page/Page.php',
        'PageArchive' => __DIR__ . '/includes/page/PageArchive.php',
 +      'PageDataRequestHandler' => __DIR__ . '/includes/linkeddata/PageDataRequestHandler.php',
        'PageExists' => __DIR__ . '/maintenance/pageExists.php',
        'PageLangLogFormatter' => __DIR__ . '/includes/logging/PageLangLogFormatter.php',
        'PageProps' => __DIR__ . '/includes/PageProps.php',
@@@ -1379,7 -1379,6 +1380,7 @@@
        'SpecialNewpages' => __DIR__ . '/includes/specials/SpecialNewpages.php',
        'SpecialPage' => __DIR__ . '/includes/specialpage/SpecialPage.php',
        'SpecialPageAction' => __DIR__ . '/includes/actions/SpecialPageAction.php',
 +      'SpecialPageData' => __DIR__ . '/includes/specials/SpecialPageData.php',
        'SpecialPageFactory' => __DIR__ . '/includes/specialpage/SpecialPageFactory.php',
        'SpecialPageLanguage' => __DIR__ . '/includes/specials/SpecialPageLanguage.php',
        'SpecialPagesWithProp' => __DIR__ . '/includes/specials/SpecialPagesWithProp.php',
@@@ -1608,8 -1607,6 +1609,8 @@@
        'WikiRevision' => __DIR__ . '/includes/import/WikiRevision.php',
        'WikiStatsOutput' => __DIR__ . '/maintenance/language/StatOutputs.php',
        'WikiTextStructure' => __DIR__ . '/includes/content/WikiTextStructure.php',
 +      'Wikimedia\\Http\\HttpAcceptNegotiator' => __DIR__ . '/includes/libs/http/HttpAcceptNegotiator.php',
 +      'Wikimedia\\Http\\HttpAcceptParser' => __DIR__ . '/includes/libs/http/HttpAcceptParser.php',
        'Wikimedia\\Rdbms\\Blob' => __DIR__ . '/includes/libs/rdbms/encasing/Blob.php',
        'Wikimedia\\Rdbms\\ChronologyProtector' => __DIR__ . '/includes/libs/rdbms/ChronologyProtector.php',
        'Wikimedia\\Rdbms\\ConnectionManager' => __DIR__ . '/includes/libs/rdbms/connectionmanager/ConnectionManager.php',