Hi, Luis.
If you mean the system language, you can do that as described here:
https://confluence.atlassian.com/cloud/set-the-default-language-744721610.html
You can also set your language in your profile:
https://confluence.atlassian.com/display/JIRACLOUD/Managing+your+User+Profile
However, not all languages are available in Cloud. Check here for information:
https://confluence.atlassian.com/cloud/languages-744721667.html
I hope it was helpful.
Kind regards,
Jaime Kirch da Silveira
Atlassian Cloud Support
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