Merge branch 'master' into filesystem

apps/files/css/files.css

apps/files/index.php

apps/files/js/filelist.js

apps/files/js/files.js

apps/files/js/keyboardshortcuts.js

apps/files/l10n/es_AR.php

apps/files/l10n/ko.php

apps/files/l10n/sl.php

apps/files/templates/index.php

apps/files_encryption/l10n/ko.php

apps/files_external/l10n/ko.php

apps/files_sharing/l10n/ko.php

apps/files_versions/l10n/ko.php

apps/user_ldap/l10n/gl.php

apps/user_ldap/l10n/ko.php

core/css/styles.css

core/js/js.js

core/l10n/ko.php

core/l10n/zh_TW.php

core/templates/installation.php