Updated German l10n.
Update VAGRANT.md

Added link to Vagrant download page
update cs translation
keep French l10n up to date
Show trends on some dashboard numbers
Merge pull request #596 from ZogStriP/keep-french-l10n-up-to-date-2013-03-30

keep French l10n up to date
Merge pull request #594 from kubabrecka/cs_update22

update cs translation
Merge pull request #591 from potthast/german-l10n

Updated German l10n.
Merge remote-tracking branch 'upstream/master'