IBX-10776: Added Languages tab

[ciastektk]

🎫 Issue	IBX-10776

Description:

This PR aligns Languages page rendering with the standard tab-group, while keeping current behavior unchanged for users.

What changed

• Added a dedicated tab group configuration for languages (groupIdentifier: languages) and registered LanguagesTab in this group.
• Refactored templates to match the common pattern:
  • ui/tab/languages.html.twig now works as the tab group container.
  • language/tab/languages.html.twig now contains the Languages tab content (the table/list view).
• Updated language list page to render via the component group (admin-ui-languages-tab-groups), consistent with other sections.

Important behavior note

By default, users will still see the same old Languages view (without visible tab navigation).
This is expected and intentional.

The tabs component renders plain content when there is only one tab in the group.
Only after a second tab is added to the languages group will the UI switch to visible tab navigation.

For QA:

Documentation:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud