Adjust installation directory & package icon file

Update Arabic Translation for 3.9.0 release

Update shortcut name on Windows

Update internal version number for OSX to 3.8.0 as well

3.7.0 release

Update French translation

bump version to 3.5.1

Merge branch 'master' into v3.5.x

Updated v3.4.0 release date to 2014-10-29

cmake/nsis: small improvements to the windows installer