To uninstall task-belarusian-desktop just follow these instructions.
sudo apt-get remove task-belarusian-desktop
This will remove just the task-belarusian-desktop package itself.
sudo apt-get remove --auto-remove task-belarusian-desktop
This will remove the task-belarusian-desktop package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for task-belarusian-desktop then this will work.
sudo apt-get purge task-belarusian-desktop
Or similarly, like this task-belarusian-desktop
sudo apt-get purge --auto-remove task-belarusian-desktop
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