Merge branch '5.4' into 6.3

* 5.4:
  [Serializer] Fix normalization relying on allowed attributes only
  [Validator] Add missing translations for Bulgarian #51931
  [String] Fix Inflector for 'icon'

Author: nicolas-grekas

Diff for: Inflector/EnglishInflector.php

@@ -253,6 +253,9 @@ final class EnglishInflector implements InflectorInterface
         // seasons (season), treasons (treason), poisons (poison), lessons (lesson)
         ['nos', 3, true, true, 'sons'],
 
+        // icons (icon)
+        ['noc', 3, true, true, 'cons'],
+
         // bacteria (bacterium), criteria (criterion), phenomena (phenomenon)
         ['no', 2, true, true, 'a'],
 

Diff for: Tests/Inflector/EnglishInflectorTest.php

@@ -295,6 +295,7 @@ public static function pluralizeProvider()
             ['tree', 'trees'],
             ['waltz', 'waltzes'],
             ['wife', 'wives'],
+            ['icon', 'icons'],
 
             // test casing: if the first letter was uppercase, it should remain so
             ['Man', 'Men'],