Czech translation update

Localized dozens of strings to the Czech language
Czech translation update
Czech translation update
Sync with upstream.
Sync with upstream.
Merge remote-tracking branch 'upstream/master'
Revert accidental deletion

Revert accidentally deleted *.php files and a changed *.mo file.
Merge branch 'master' of git://github.com/MichaelGrafnetter/horde
Update cs translation.