[tx-robot] updated from transifex

apps/files/l10n/pl.php

l10n/pl/files.po

l10n/si_LK/settings.po

l10n/templates/core.pot

l10n/templates/files.pot

l10n/templates/files_encryption.pot

l10n/templates/files_external.pot

l10n/templates/files_sharing.pot

l10n/templates/files_versions.pot

l10n/templates/lib.pot

l10n/templates/settings.pot

l10n/templates/user_ldap.pot

settings/l10n/si_LK.php