[tx-robot] updated from transifex

apps/files/l10n/sk_SK.php

apps/files_external/l10n/fa.php

apps/files_versions/l10n/fa.php

core/l10n/ja_JP.php

core/l10n/sk_SK.php

l10n/ar/core.po

l10n/ar/files.po

l10n/ar/files_external.po

l10n/ar/files_sharing.po

l10n/ar/files_trashbin.po

l10n/ar/lib.po

l10n/ar/settings.po

l10n/ar/user_ldap.po

l10n/bg_BG/core.po

l10n/bg_BG/files.po

l10n/bg_BG/files_external.po

l10n/bg_BG/files_sharing.po

l10n/bg_BG/files_trashbin.po

l10n/bg_BG/lib.po

l10n/bg_BG/settings.po