No worries. It seemed as though you were looking for ancestry advice, here.
Sorry I don't use anything so modern as a Mobile App for My Heritage so I can't help.
Now if you were using Family Tree Builder on your computer...
Dear MH team,
MH App for iPhone and iPad.
it is claimed that App support 32 languages.
I can not find the option how to switch App user interface language into diferent language than ENU.
Thank you for your post here on the forum.
The app does support 32 languages however it depends on the language settings that your mobile device has in place.
For example if I download the app and my phone language settings are set to Spanish then the app will also be downloaded in the Spanish language.
In short to have the app in another language you would need to adjust your mobile device language settings.
Trusting this has proven useful to you.
What a surprise !
iPad and even iPhone 5s with iOS 8.2 have very few languages and not my native Lithuanian language.
I would be happy if a workaround will appear one day.