Chore: Sentence case for subelement label.

Author: Adnan-cds

src/Element/AddressLookupElement.php

@@ -99,7 +99,7 @@ public static function processAddressLookupElement(&$element, FormStateInterface
 
     $element['address_search']['address_searchstring'] = [
       '#type' => 'textfield',
-      '#title' => t('Postcode or Street'),
+      '#title' => t('Postcode or street'),
       '#description' => $element['#address_search_description'] ?? t('Enter the postcode…'),
       '#maxlength' => 64,
       '#size' => 64,

tests/src/FunctionalJavascript/AddressLookupErrorMsgTest.php

@@ -104,7 +104,7 @@ public function testRequiredRadioAndPostcode(): void {
     $session_assert->waitForElementVisible('css', '.messages--error');
 
     $session_assert->statusMessageContains('2 errors have been found:', type: 'error');
-    $session_assert->statusMessageContains('Postcode or Street', type: 'error');
+    $session_assert->statusMessageContains('Postcode or street', type: 'error');
     $session_assert->statusMessageContains('Postcode', type: 'error');
 
     // Now fill in the required postcode and submit again.