Hello,
I looked at your app and only see one translation file (English). When I look at the settings in Xcode, only English is included. So I think you need to add another language.
Here you will find the settings for Localizations:
Tap on project name at the top of the navigation, then Project UltimatePortfolio, Info tab, there you will find Localization, add a language.
I usually then choose Export Localizations... which is in the Product menu. (Send the translation file to a translation agency or colleague.) Try opening the file yourself and translate a single line or two. Then select Import Localizations... is in the Product menu. You will now see the files in the navigation menu on the left in Xcode, you can try translating directly in Xcode, by selecting the Localizable-file. (I am using Xcode 16.)
You can test what I write in another smaller project to see how smooth it is…
Please check back, so I know how it goes for you!