Frontend: add missing Hindi translations for UI components

[SinghaAnirban005]

Summary

This PR adds the missing Hindi translations for several UI components that were previously displaying English text despite the Hindi language being selected. Ensuring complete localization improves accessibility and user experience for Hindi-speaking users.

Fixes #3386

Changes Made

1. Updated glossary.json under hindi translations
2. Updated translation.json under hindi translation with missing key-values
3. Translated the filter placeholder in NamespacesAutocomplete.tsx

Screenshots

1. Global Search component

2. Filter placeholder

3. Expand/Shrink Sidebar labels

4. "General" tab in settings

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: SinghaAnirban005 / name: Anirban Singha (17e5f69, 400bb38)

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