Issue #2361823 by rpayanm, javivf: Remove usage of drupal_strtolower().

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

...ules/block_content/src/Tests/BlockContentCreationTest.php

...modules/block_content/src/Tests/BlockContentFieldTest.php

core/modules/block_content/src/Tests/PageEditTest.php

core/modules/color/color.module

core/modules/config/src/Tests/ConfigExportImportUITest.php

core/modules/contact/src/Tests/ContactSitewideTest.php

core/modules/contact/src/Tests/ContactStorageTest.php

core/modules/datetime/src/Tests/DateTimeFieldTest.php

...odules/entity_reference/src/EntityReferenceController.php

...erence/src/Tests/EntityReferenceFieldDefaultValueTest.php

...es/entity_reference/src/Tests/EntityReferenceItemTest.php

core/modules/field/src/Tests/Boolean/BooleanFieldTest.php

core/modules/field/src/Tests/Email/EmailFieldTest.php

core/modules/field/src/Tests/FieldAttachStorageTest.php

core/modules/field/src/Tests/FieldCrudTest.php

core/modules/field/src/Tests/FieldUnitTestBase.php

core/modules/field/src/Tests/Number/NumberFieldTest.php

core/modules/field/src/Tests/TranslationTest.php

core/modules/field/src/Tests/TranslationWebTest.php