Localisation updates from http://translatewiki.net.

Change-Id: Iebcb3d08fa9f79d59ea77fbf246ff416ead5eaa2
Re-organize classes to be a bit more organized

Change-Id: Ie3500c4520a09be28f1856447e66265dd499a680
GitHub: https://github.com/wikimedia/apps-android-commons/pull/36
Add Campaign & CampaignContribution classes

Change-Id: I2f1bfa720826b67912cc2635347b13e6beac4629