Minor UI adjustments

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Minor UI adjustments:
  • Code used to overflow in the conversation bubble when there was no match for language
  • The input field in Conversation touched the bottom of the viewport in mobile screens.
  • Font size in the user questions looked larger in mobile browsers.
  • Limited characters in Settings/Docs in table column document name to avoid overflows
  • In api/delete_old remove docs from the collection even if they are missing from the file tree.

• Why was this change needed? (You can also link to an open issue here)
  UI

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@0584c29). Learn more about missing BASE report.
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
application/api/user/routes.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1456   +/-   ##
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  Coverage        ?   35.96%           
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  Files           ?       68           
  Lines           ?     3275           
  Branches        ?        0           
=======================================
  Hits            ?     1178           
  Misses          ?     2097           
  Partials        ?        0           

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[dartpain]

Great, thank you!