Translations to languages other than English seems to not work in KMyMoney. If I manually select any language in Help -> Switch application language only KDE Framework stuff is translated (buttons in confirmation dialogs, etc.), but not the KMyMoney stuff.
Well, I've just realized that all KDE applications are displayed English only... Only KDE Plasma strings seems to have translations working.
I cannot reproduce, I could at least switch back-n-forth between US English and Spanish successfully. How did you install fedora? (kde spin or other)? If not kde spin, there's possibly a missing dependency.
You were right: I had checked for kde-l10n and kde-l10n-it to be installed on the system and I thought it was enough. But after having installed the langpacks-it metapackage all KDE apps are now correctly translated. I had installed my system from Netinstall image many versions ago (maybe F25 or F26) and then I always did a system upgrade. I have checked on a more recent installation on a Virtual Machine (which I done from a Fedora-Everything) and it doesn't show any problem. Thanks