[tx-robot] updated from transifex

apps/dav/l10n/is.js

apps/dav/l10n/is.json

apps/files/l10n/da.js

apps/files/l10n/da.json

apps/files/l10n/fr.js

apps/files/l10n/fr.json

apps/files/l10n/is.js

apps/files/l10n/is.json

apps/files/l10n/it.js

apps/files/l10n/it.json

apps/files/l10n/pl.js

apps/files/l10n/pl.json

apps/files/l10n/pt_BR.js

apps/files/l10n/pt_BR.json

apps/files/l10n/sr.js

apps/files/l10n/sr.json

apps/files_external/l10n/is.js

apps/files_external/l10n/is.json

apps/theming/l10n/is.js

apps/theming/l10n/is.json