Czech translation file

czech translation of davdroid text strings
typo/missing string fix
[Translations] Add Serbian
Serbian translation fixes
Merge pull request #324 from pejakm/srtr

[Translations] Add Serbian – thanks to @srtr
Merge pull request #318 from svetlemodry/master

Czech translation – thanks to @svetlemodry
Don't fail to detect resources if principal is not available for CalDAV/CardDAV
Version bump to 0.6.3

Add translator info
Setup: always show 401 Unauthorized errors

* also increase version code and version to 0.6.3
Serbian translation fixes and updates
Merge pull request #329 from pejakm/srupd

Serbian translation fixes and updates
Send appropriate Accept/Content-Type headers + tests (closes #328)
Merge branch 'master' of github.com:rfc2822/davdroid
Allow adb backups (not Google cloud backups!) for DAVdroid because of user request
Added Chinese Simplified translation.
Merge pull request #338 from phy25/values-zh-CN

Add Chinese Simplified translation. Thanks to @phy25
Use new ical4j version to fix timezone bug

* use ical4j 1.0.x-maintenance (self-compiled 27 Oct 2014)
* upstream fixes timezone bug (fixes #186)
* try to turn off the check for time zone updates because it's unnecessary in most cases (fixes #239)
* mention ical4j and its major version in generated iCalendars
* update to ez-vcard 0.9.6 from upstream
* version bump to 0.6.4
Merge branch 'master' of github.com:rfc2822/davdroid
Ensure trailing slashes are always used for collections + tests
Add TLS cipher info to tests (see #344)