installer bundles KP 2.27
Building the XPI through Visual Studio (or MSBUILD, etc.) no longer requires an external ZIP application (also a ~3% reduction in XPI size)
Revert "Building the XPI through Visual Studio (or MSBUILD, etc.) no longer requires an external ZIP application (also a ~3% reduction in XPI size)"

This reverts commit 9e82770202880e2ac517c7016aa25a2e71df7f54.

Turns out that .NET ZipArchive class is unable to output valid zip files if they contain subdirectories so the resulting XPI is useless. I can't find any alternative zip libraries that work so we have to keep manually hacking around with 7zip executable dependencies for the foreseeable future :-(
updated Danish translations;
1.4.3b1