I just started using a PortableApps app in order to improve the page about that option on our FOSS wiki. I hope to add a page about how a portable version (as a complement to a normal install) can expand options.
Download & installation went well, except for a few minor ambiguity hitches regarding what was included in the Portable build.
But my big issue arose when doing support for a new user on Facebook. He had downloaded a Standalone (rather than the whole suite), then installed with selected his non-English language. But, when launched, the application was still in English! I am a monoglot and was pessimistic about whether I'd be able to do useful tests.
(I was able to discover the solution in an .INI setting that hadn't been updated from 'us-EN')
But my experiments had 3 items that could be addressed:
1) first & foremost, the installer should've set the dialect DefaultIfNotExists value in the Languages chunk of the .ini for the portable (This is probably a glitch in a single standalone installer.)
2) The installer's language selection label is English and lacks an icon. That might present a problem for users of non-Latin alphabets. It would probably be good if the translated word for the label 'Language:' was part of the menu item. e.g.:
langue : français
3) As the final part of the installation, there was a notice (in English) about file compatibility with previous versions. Once the other language had been installed, the rest of the installer GUI was in that language. But this final message was not.
I was installing the Italian dialect of GrampsPortable v5.1.3 from the Education category.