merge master into filesystem

apps/files/js/files.js

apps/files/l10n/ja_JP.php

apps/files/l10n/lv.php

apps/files/l10n/th_TH.php

apps/files_sharing/l10n/uk.php

apps/files_sharing/templates/public.php

apps/user_ldap/l10n/ko.php

apps/user_webdavauth/l10n/th_TH.php

config/config.sample.php

core/l10n/es_AR.php

core/l10n/ja_JP.php

core/l10n/ko.php

core/l10n/ru.php

core/l10n/th_TH.php

l10n/ar/files.po

l10n/bg_BG/files.po

l10n/ca/files.po

l10n/cs_CZ/files.po

l10n/da/files.po

l10n/de/core.po