Merge pull request #62 from DanWin/develop

German translation updated.
Merge pull request #63 from DanWin/develop

Some minor changes to German translation.
allow custom files in windows build by adding to the distribute/windows/stream folder
Added potrace as dependency for linux packages
Fix: Reload SVG files instead of using already loaded versions
Use potrace/mkbitmap binaries in VisiCut folder if present
Update background image on Capture in CalibrateCamera dialog
Allow predefined content in Mac OSX bundle
fix: mac os buildscript