How can I set English as a language whose Thunderbird works (not Czech)?

I reinstalled my Thunderbird but the new version automatically the whole environment in Czech language. How can I change it back to English?

You should uninstall Thunderbird via Control Panel > programs and features.
Select Mozilla Thunderbird and click on uninstall.

Then download a new version from the link below.
Make sure that you select the appropriate language and OS.
There are two English versions, one is British and the other American States.

Tags: Thunderbird

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