The central place for all the documentation related to Luminance HDR is on this sourceforge wiki.
If you want to contribute translating Luminance HDR for your language here’s an howto that explains the procedure to become a maintainer.
See also this tutorial (french), that covers version 1.7.1.
QTpfsgui/Luminance is partially based on the existing opensource packages pfstools/pfstmo/pfscalibration by Grzegorz Krawczyk and Rafal Mantiuk, and on “qpfstmo”, by Nicholas Phillips. Without their contribution all of this would have not been possible. More information can be found here: