Merge branch 'master' into file_encryption_external_storage_fixes

apps/files/l10n/pt_PT.php

apps/files_encryption/hooks/hooks.php

apps/files_encryption/l10n/et_EE.php

apps/files_encryption/l10n/pt_PT.php

apps/files_encryption/lib/proxy.php

apps/files_encryption/lib/session.php

apps/files_encryption/lib/stream.php

apps/files_encryption/lib/util.php

apps/files_encryption/tests/crypt.php

apps/files_encryption/tests/util.php

apps/files_sharing/public.php

core/l10n/ca.php

core/l10n/et_EE.php

core/l10n/pt_PT.php

l10n/af_ZA/core.po

l10n/af_ZA/lib.po

l10n/ar/core.po

l10n/ar/files.po

l10n/ar/files_external.po

l10n/ar/files_sharing.po