Localize preference and address review feedback

Remove css classes after hover is disposed.
Update tab bars after preference has been changed.

Contributed on behalf of STMicroelectronics

packages/core/src/browser/core-preferences.ts

@@ -83,7 +83,7 @@ export const corePreferenceSchema: PreferenceSchema = {
         'window.extendedTabBarPreview': {
             type: 'boolean',
             default: false,
-            description: 'Controls whether more information about the tab should be displayed in horizontal tab bars.'
+            description: nls.localize('theia/core/extendedTabBarPreview', 'Controls whether more information about the tab should be displayed in horizontal tab bars.')
         },
         'window.menuBarVisibility': {
             type: 'string',

packages/core/src/browser/hover-service.ts

@@ -132,6 +132,7 @@ export class HoverService {
             dispose: () => {
                 this.lastHidHover = Date.now();
                 host.classList.remove(updatedPosition);
+                host.classList.remove(...cssClasses ?? []);
             }
         });
 

packages/core/src/browser/shell/application-shell.ts

@@ -266,6 +266,14 @@ export class ApplicationShell extends Widget {
                 }
             });
         }
+
+        this.corePreferences.onPreferenceChanged(preference => {
+            if (preference.preferenceName === 'window.extendedTabBarPreview') {
+                this.allTabBars.forEach(tabBar => {
+                    tabBar.update();
+                });
+            }
+        });
     }
 
     protected initializeShell(): void {