ownCloud gives you freedom and control over your own data. A personal cloud which runs on your own server.

• 📁 Access your Data You can store your files, contacts, calendars and more on a server of your choosing.
• 📦 Sync your Data You keep your files, contacts, calendars and more synchronized amongst your devices.
• 🔄 Share your Data You share your data with others, and give them access to your latest photo galleries, your calendar or anything else you want them to see.
• 🚀 Expandable with dozens of Apps ...like Calendar, Contacts, Mail or News.
• ☁️ All Benefits of the Cloud ...on your own Server.
• 🔒 Encryption You can encrypt data in transit with secure https connections. You can enable the encryption app to encrypt data on storage for improved security and privacy.
• ...

https://doc.owncloud.org/server/9.0/developer_manual/app/index.html

https://owncloud.org/contribute/

Learn about the different ways you can get support for ownCloud: https://owncloud.org/support/

• 📋 Forum
• ✉️ Mailing list
• #️⃣ IRC channel
• 👥 [Facebook] (https://facebook.com/ownclouders)
• 🐣 Twitter

Please submit translations via Transifex: https://www.transifex.com/projects/p/owncloud/

For more detailed information about translations: http://doc.owncloud.org/server/9.0/developer_manual/core/translation.html