Description of problem:

In the MyGroupsSidebarItem component, pluralization is currently handled by appending an *"s" *to the translated string. This approach does not work for many languages, since pluralization rules differ and cannot be hardcoded.

<MyGroupsSidebarItem
  key={menuItem.name}
  icon={renderIcon(menuItem.icon ?? '')}
  singularTitle={translatedText}
  pluralTitle={`${translatedText}s`}
/>

Prerequisites (if any, like setup, operators/versions):

• RHDH with i18n enabled.
• A language other than English (where pluralization may not use "s").
  Steps to Reproduce

1. Switch the application language to a non-English locale (e.g., French, German, Japanese).
2. Navigate to the sidebar where MyGroupsSidebarItem is rendered.
3. Observe the plural label.

   Actual results:

   Pluralization is done by simply appending "s", which produces incorrect translations in non-English locales.

   Expected results:

   Pluralization should use proper i18n pluralization rules provided by the translation library (e.g., i18next plural forms or backstage ), rather than hardcoding "s".

   Reproducibility (Always/Intermittent/Only Once):

   Always