Merge branch 'master' into files_encryption

CONTRIBUTING.md

apps/files/l10n/bn_BD.php

apps/files/l10n/ca.php

apps/files/l10n/cs_CZ.php

apps/files/l10n/de.php

apps/files/l10n/de_DE.php

apps/files/l10n/es.php

apps/files/l10n/fi_FI.php

apps/files/l10n/fr.php

apps/files/l10n/gl.php

apps/files/l10n/is.php

apps/files/l10n/it.php

apps/files/l10n/ja_JP.php

apps/files/l10n/ko.php

apps/files/l10n/pt_PT.php

apps/files/l10n/ro.php

apps/files/l10n/ru.php

apps/files/l10n/zh_TW.php

apps/files_encryption/l10n/bn_BD.php

apps/files_external/l10n/bn_BD.php