ownCloud gives you freedom and control over your own data. A personal cloud which runs on your own server.
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http://doc.owncloud.org/server/5.0/developer_manual/app/gettingstarted.html
http://owncloud.org/dev/contribute/
Please submit translations via Transifex: https://www.transifex.com/projects/p/owncloud/
For more detailed information about translations: http://owncloud.org/dev/translation/