fix: Language selection box is empty which should be default

[Sayan4444]

Proposed changes (including videos or screenshots)

BEFORE THE FIX
https://github.com/RocketChat/Rocket.Chat/assets/112304873/0fdc1b0f-4e42-4546-87b8-3968e56e1c9c

AFTER THE FIX
https://github.com/RocketChat/Rocket.Chat/assets/112304873/ca4c6cc2-f121-4561-a6ff-5ba1d93a819f

REASON BEHIND CHANGES

The type of 'language' field in default values was string | undefined. When undefined it wont show anything, so we need to use correct type for 'language' which is only 'string' and also if language is undefined(when useUserPreference returns undefiend) we should assign it with blank ''

Issue(s)

This should close issues :-
fix #31307

Steps to test or reproduce

1. Go to Account
2. Click on Preferences
3. See language selection box

Further comments

[changeset-bot]

🦋 Changeset detected

Latest commit: ed0f522

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 30 packages

Name	Type
@rocket.chat/meteor	Patch
@rocket.chat/core-typings	Patch
@rocket.chat/rest-typings	Patch
@rocket.chat/core-services	Patch
@rocket.chat/cron	Patch
@rocket.chat/gazzodown	Patch
@rocket.chat/livechat	Patch
@rocket.chat/model-typings	Patch
@rocket.chat/ui-contexts	Patch
@rocket.chat/account-service	Patch
@rocket.chat/authorization-service	Patch
@rocket.chat/ddp-streamer	Patch
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/presence-service	Patch
@rocket.chat/queue-worker	Patch
@rocket.chat/stream-hub-service	Patch
@rocket.chat/api-client	Patch
@rocket.chat/license	Patch
@rocket.chat/omnichannel-services	Patch
@rocket.chat/pdf-worker	Patch
@rocket.chat/presence	Patch
rocketchat-services	Patch
@rocket.chat/ddp-client	Patch
@rocket.chat/fuselage-ui-kit	Patch
@rocket.chat/models	Patch
@rocket.chat/ui-client	Patch
@rocket.chat/ui-video-conf	Patch
@rocket.chat/uikit-playground	Patch
@rocket.chat/web-ui-registration	Patch
@rocket.chat/instance-status	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (caa7707) 49.33% compared to head (ed0f522) 49.30%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #31312      +/-   ##
===========================================
- Coverage    49.33%   49.30%   -0.03%     
===========================================
  Files         3299     3299              
  Lines        81122    81122              
  Branches     16594    16594              
===========================================
- Hits         40020    40000      -20     
- Misses       36454    36462       +8     
- Partials      4648     4660      +12     

Flag	Coverage Δ
e2e	52.52% <ø> (-0.09%)	⬇️
e2e-api	40.63% <ø> (-0.01%)	⬇️
unit	76.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.