Wrong language of zoho creator's app

Wrong language of zoho creator's app

I have installed the zoho creator's app version 5.17.1 on my iphone 7 version 12.4.
The OS language is set to (swiss) german. 
Unfortunately, since a couple of weeks, the zoho creator's app appears in dansk language!
log in = Log ind, logout = Log ud, settings=Indstillinger, and so forth.
I have deleted and reinstalled the app but the bug remains.
I want to use the app in german as it used to be.

Can you please check this bug?

Kind regards, Daniel