[Security Solution] Maintenance Window callout: Improve UI copy after…

… tech writer review (elastic#157076)

## Summary

Tweaked UI wording after consulting with a tech writer

<img width="1329" alt="Screenshot 2023-05-08 at 22 51 39"
src="https://user-images.githubusercontent.com/15949146/236932465-43e6181e-c2dc-453a-b109-0ab22bbae695.png">

**Addresses:** elastic#155099
**Main PR:** elastic#155386

(cherry picked from commit 352c8d8)

x-pack/plugins/security_solution/cypress/e2e/detection_rules/maintenance_window.cy.ts

@@ -53,6 +53,6 @@ describe('Maintenance window callout on Rule Management page', () => {
   it('Displays the callout when there are running maintenance windows', () => {
     visit(DETECTIONS_RULE_MANAGEMENT_URL);
 
-    cy.contains('A maintenance window is currently running');
+    cy.contains('Maintenance window is running');
   });
 });

x-pack/plugins/security_solution/public/detection_engine/rule_management_ui/components/maintenance_window_callout/maintenance_window_callout.test.tsx

@@ -107,7 +107,7 @@ describe('MaintenanceWindowCallout', () => {
 
     const { findAllByText } = render(<MaintenanceWindowCallout />, { wrapper: TestProviders });
 
-    expect(await findAllByText('A maintenance window is currently running')).toHaveLength(1);
+    expect(await findAllByText('Maintenance window is running')).toHaveLength(1);
     expect(fetchActiveMaintenanceWindowsMock).toHaveBeenCalledTimes(1);
   });
 
@@ -119,7 +119,7 @@ describe('MaintenanceWindowCallout', () => {
 
     const { findAllByText } = render(<MaintenanceWindowCallout />, { wrapper: TestProviders });
 
-    expect(await findAllByText('A maintenance window is currently running')).toHaveLength(1);
+    expect(await findAllByText('Maintenance window is running')).toHaveLength(1);
     expect(fetchActiveMaintenanceWindowsMock).toHaveBeenCalledTimes(1);
   });
 
@@ -128,7 +128,7 @@ describe('MaintenanceWindowCallout', () => {
 
     const { findByText } = render(<MaintenanceWindowCallout />, { wrapper: TestProviders });
 
-    expect(await findByText('A maintenance window is currently running')).toBeInTheDocument();
+    expect(await findByText('Maintenance window is running')).toBeInTheDocument();
     expect(fetchActiveMaintenanceWindowsMock).toHaveBeenCalledTimes(1);
   });
 
@@ -184,8 +184,8 @@ describe('MaintenanceWindowCallout', () => {
     await waitFor(() => {
       expect(appToastsMock.addError).toHaveBeenCalledTimes(1);
       expect(appToastsMock.addError).toHaveBeenCalledWith(mockError, {
-        title: 'Failed to check if any maintenance window is currently running',
-        toastMessage: "Notification actions won't run while a maintenance window is running.",
+        title: 'Failed to check if maintenance windows are active',
+        toastMessage: 'Rule notifications are stopped while the maintenance window is running.',
       });
     });
   });
@@ -227,6 +227,6 @@ describe('MaintenanceWindowCallout', () => {
 
     const { findByText } = render(<MaintenanceWindowCallout />, { wrapper: TestProviders });
 
-    expect(await findByText('A maintenance window is currently running')).toBeInTheDocument();
+    expect(await findByText('Maintenance window is running')).toBeInTheDocument();
   });
 });

x-pack/plugins/security_solution/public/detection_engine/rule_management_ui/components/maintenance_window_callout/translations.ts

@@ -10,27 +10,27 @@ import { i18n } from '@kbn/i18n';
 export const MAINTENANCE_WINDOW_RUNNING = i18n.translate(
   'xpack.securitySolution.detectionEngine.ruleManagementUi.maintenanceWindowCallout.maintenanceWindowActive',
   {
-    defaultMessage: 'A maintenance window is currently running',
+    defaultMessage: 'Maintenance window is running',
   }
 );
 
 export const MAINTENANCE_WINDOW_RUNNING_DESCRIPTION = i18n.translate(
   'xpack.securitySolution.detectionEngine.ruleManagementUi.maintenanceWindowCallout.maintenanceWindowActiveDescription',
   {
-    defaultMessage: "Notification actions won't run while a maintenance window is running.",
+    defaultMessage: 'Rule notifications are stopped while the maintenance window is running.',
   }
 );
 
 export const FETCH_ERROR = i18n.translate(
   'xpack.securitySolution.detectionEngine.ruleManagementUi.maintenanceWindowCallout.fetchError',
   {
-    defaultMessage: 'Failed to check if any maintenance window is currently running',
+    defaultMessage: 'Failed to check if maintenance windows are active',
   }
 );
 
 export const FETCH_ERROR_DESCRIPTION = i18n.translate(
   'xpack.securitySolution.detectionEngine.ruleManagementUi.maintenanceWindowCallout.fetchErrorDescription',
   {
-    defaultMessage: "Notification actions won't run while a maintenance window is running.",
+    defaultMessage: 'Rule notifications are stopped while the maintenance window is running.',
   }
 );