Your LimeSurvey version: 5
Own server or LimeSurvey hosting: Own
Survey theme/template: Vanilla
==================Hello , I am trying to change the default language that appears when creating a survey.
I have select spanish for the Default site language in the configuration but when i go to create a new survey the language that appear in the Base Language is English. thanks for your attention

Unfortunately you did not mention the entire version number.

This bug was called "fixed" in version 5.3.9. (220411)

-Fixed issue #17882: Base language for new surveys is English instead of default language (#2333) (Gabriel Jenik)