[tx-robot] updated from transifex

apps/files_external/l10n/nl.php

apps/files_external/l10n/sk_SK.php

core/l10n/cs_CZ.php

core/l10n/de.php

core/l10n/de_DE.php

core/l10n/el.php

core/l10n/es.php

core/l10n/gl.php

core/l10n/it.php

core/l10n/nl.php

core/l10n/nn_NO.php

core/l10n/pt_BR.php

core/l10n/sk_SK.php

l10n/cs_CZ/core.po

l10n/de/core.po

l10n/de/settings.po

l10n/de_DE/core.po

l10n/de_DE/settings.po

l10n/el/core.po

l10n/es/core.po