Merge pull request #26881 from nextcloud/backport/26869/stable21

[stable21] l10n: Spelling unification

apps/dav/lib/Connector/Sabre/MaintenancePlugin.php

@@ -82,7 +82,7 @@ class MaintenancePlugin extends ServerPlugin {
 	 */
 	public function checkMaintenanceMode() {
 		if ($this->config->getSystemValueBool('maintenance')) {
-			throw new ServiceUnavailable($this->l10n->t('System in maintenance mode.'));
+			throw new ServiceUnavailable($this->l10n->t('System is in maintenance mode.'));
 		}
 		if (Util::needUpgrade()) {
 			throw new ServiceUnavailable($this->l10n->t('Upgrade needed'));

apps/dav/tests/unit/Connector/Sabre/MaintenancePluginTest.php

@@ -55,7 +55,7 @@ class MaintenancePluginTest extends TestCase {
 
 	public function testMaintenanceMode() {
 		$this->expectException(\Sabre\DAV\Exception\ServiceUnavailable::class);
-		$this->expectExceptionMessage('System in maintenance mode.');
+		$this->expectExceptionMessage('System is in maintenance mode.');
 
 		$this->config
 			->expects($this->exactly(1))