Merge master into oc_preview

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COPYING-README

apps/files/ajax/download.php

apps/files/ajax/list.php

apps/files/ajax/newfile.php

apps/files/ajax/rename.php

apps/files/appinfo/app.php

apps/files/appinfo/routes.php

apps/files/css/files.css

apps/files/index.php

apps/files/js/file-upload.js

apps/files/js/fileactions.js

apps/files/js/filelist.js

apps/files/js/files.js

apps/files/js/keyboardshortcuts.js

apps/files/l10n/ar.php

apps/files/l10n/bg_BG.php

apps/files/l10n/bn_BD.php

apps/files/l10n/ca.php

apps/files/l10n/cs_CZ.php