Hello @mohammedrezeq,
Regarding your error message it seems that you used different spelling, at least one place is “english” (in the setting sheet) instead of “English (en)”.
Further hints for working with multiple languages can be found with the search function in this forum and support atticles, e.g.
https://support.kobotoolbox.org/language_xls.html
https://community.kobotoolbox.org/t/multi-language-ar-en-survey/3080
https://support.kobotoolbox.org/language_dashboard.html?highlight=multi%20language
