fix: Replace custom language names list with standard Intl DisplayNames API #2332

[ahtesham-quraish]

Description

Replace custom language names list with standard Intl DisplayNames API #2332

Supporting information

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Testing instructions

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Other information

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• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Deprecated propTypes, defaultProps, and injectIntl patterns are not used in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Imports avoid using ../. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.49%. Comparing base (0e1550a) to head (9f4da76).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...l/components/TranscriptWidget/LanguageSelector.jsx	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2371      +/-   ##
==========================================
+ Coverage   94.44%   94.49%   +0.05%     
==========================================
  Files        1169     1169              
  Lines       25102    25149      +47     
  Branches     5473     5492      +19     
==========================================
+ Hits        23708    23765      +57     
+ Misses       1328     1320       -8     
+ Partials       66       64       -2     

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