Issue #3179258 by julien, paulocs: Spaces before or after a string searched to...

Issue #3179258 by julien, paulocs: Spaces before or after a string searched to be translated returns nothing

(cherry picked from commit d598f541)

core/modules/locale/src/Form/TranslateFilterForm.php

@@ -85,7 +85,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
     $filters = $this->translateFilters();
     foreach ($filters as $name => $filter) {
       if ($form_state->hasValue($name)) {
-        $_SESSION['locale_translate_filter'][$name] = $form_state->getValue($name);
+        $_SESSION['locale_translate_filter'][$name] = trim($form_state->getValue($name));
       }
     }
     $form_state->setRedirect('locale.translate_page');

core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php

@@ -81,10 +81,13 @@ public function testStringTranslation() {
     $this->assertText($name, 'Test language added.');
     $this->drupalLogout();
 
+    // Add a whitespace at the end of string to ensure it is found.
+    $name_ws = $name . " ";
+
     // Search for the name and translate it.
     $this->drupalLogin($translate_user);
     $search = [
-      'string' => $name,
+      'string' => $name_ws,
       'langcode' => $langcode,
       'translation' => 'untranslated',
     ];