Issue #2361789 by rpayanm, jamesdixon, javivf: Remove usage of decode_entities().

...re/Field/Plugin/Field/FieldWidget/OptionsSelectWidget.php

core/lib/Drupal/Core/Mail/MailFormatHelper.php

...les/contextual/src/Plugin/views/field/ContextualLinks.php

...ules/entity_reference/src/EntityReferenceAutocomplete.php

core/modules/filter/filter.module

core/modules/filter/src/Tests/FilterUnitTest.php

core/modules/locale/locale.module

core/modules/search/search.module

core/modules/search/src/Tests/SearchPageTextTest.php

core/modules/simpletest/src/WebTestBase.php

...ules/views/src/Plugin/views/display/DisplayPluginBase.php

.../modules/views/src/Plugin/views/field/FieldPluginBase.php

core/modules/views/src/Plugin/views/field/Links.php

...odules/views/src/Plugin/views/filter/FilterPluginBase.php

core/modules/views/src/Tests/Handler/FieldWebTest.php

core/modules/views/src/ViewExecutable.php

core/modules/views/views.theme.inc