Update main menu to display 'Dashboards' for consistency. Fixes opens…

…earch-project#4296

This resolves the inconsistency highlighted in issue opensearch-project#4296 (opensearch-project#4296). The decision to make this change was made in issue opensearch-project#68 (opensearch-project/ux#68)."

Signed-off-by: Danila Gulderov <gulderov@ya.ru>

src/plugins/dashboard/public/plugin.tsx

@@ -360,7 +360,7 @@ export class DashboardPlugin
 
     const app: App = {
       id: DashboardConstants.DASHBOARDS_ID,
-      title: 'Dashboard',
+      title: 'Dashboards',
       order: 2500,
       euiIconType: 'inputOutput',
       defaultPath: `#${DashboardConstants.LANDING_PAGE_PATH}`,