Hi @Okara Ihor welcome to the community. Do you have a line below the 'Installed Languages' called 'Default Languages'? If you click 'Edit Settings' in the upper right corner you should get a drop down for Default Languages and you should be able to change your setting.
Here's an article from Atlassian on the subject: choosing-a-default-language
Hope that helps.
how Installed languages?
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