feat(ui, localization): Add confirmation dialog for end vote in Polls

[xsahil03x]

Fixes: #2211

Description of the pull request

This pull request adds a confirmation dialog for end vote in Polls.

[codecov]

Codecov Report

Attention: Patch coverage is 94.54545% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.08%. Comparing base (8a3513c) to head (5e6790a).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...t_flutter/lib/src/message_widget/poll_message.dart	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2237      +/-   ##
==========================================
+ Coverage   63.00%   63.08%   +0.07%     
==========================================
  Files         400      401       +1     
  Lines       25155    25209      +54     
==========================================
+ Hits        15849    15903      +54     
  Misses       9306     9306              

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