This site is being deprecated.
Please see the official X‑Plane Support page for help.
Do the following: Under the menu[i] Settings[/i], pull-down [i]Operations and Warnings[/i]. First choice in that box is[i] Language[/i].
You may get additional information here in case this doesn't work.
thanks for your answer. But in the iOS App there ist no option what you describe.
This site is no longer being actively maintained.