Merge pull request #10407 from owncloud/rm-obsolete-japanese

apps/files/l10n/ja_JP.php

apps/files_encryption/l10n/ja_JP.php

apps/files_external/l10n/ja_JP.php

apps/files_sharing/l10n/ja_JP.php

apps/files_trashbin/l10n/ja_JP.php

apps/files_versions/l10n/ja_JP.php

apps/user_ldap/l10n/ja_JP.php

apps/user_webdavauth/l10n/ja_JP.php

core/l10n/ja_JP.php

lib/l10n/ja_JP.php

settings/l10n/ja_JP.php