Hi, We've recently added makefiles to build Geany on Windows. There are instructions at: http://geany.uvena.de/Support/BuildingOnWin32
For now you can install Subversion for Windows to checkout the latest Geany with Windows makefiles, or wait for Geany 0.8 which hopefully will be released later this month.
At the moment the message catalogs (.mo) for translations are not generated by the Windows makefiles, but you can copy across the ca de pl locale directories from the 0.7 Windows release to the data/ subdirectory, or use locale directories generated on Linux (or from a Linux binary package). Message catalog generation will be added to the Windows makefiles in the next few weeks. Note that the Windows binary releases will have the message catalogs as always.