[tx-robot] updated from transifex

apps/files/l10n/sl.php

apps/files_encryption/l10n/es.php

apps/files_encryption/l10n/eu.php

apps/files_encryption/l10n/fr.php

core/l10n/es_AR.php

core/l10n/sl.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

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