I am working on an UBL/PePPoL Invoice viewer.
UBL/PePPoL is an universal xml-structure for invoices/creditnote’s (and more). See https://en.wikipedia.org/wiki/Universal_Business_Language
It is available as 64-bit download at https://www.zittergie.be/download/UBLViewer.hpkg.zip
Please test, translate and give feedback.
To translate the app: See the
/system/apps/UBLViewer/local for an example. Send me the textfile and I will add the translation to the package.
Next step is adding it to haikuports.