[tx-robot] updated from transifex

apps/dav/l10n/nb.js

apps/dav/l10n/nb.json

apps/dav/l10n/ru.js

apps/dav/l10n/ru.json

apps/dav/l10n/sk.js

apps/dav/l10n/sk.json

apps/dav/l10n/sr.js

apps/dav/l10n/sr.json

apps/files/l10n/bg.js

apps/files/l10n/bg.json

apps/files/l10n/ca.js

apps/files/l10n/ca.json

apps/files/l10n/cs.js

apps/files/l10n/cs.json

apps/files/l10n/da.js

apps/files/l10n/da.json

apps/files/l10n/de.js

apps/files/l10n/de.json

apps/files/l10n/de_DE.js

apps/files/l10n/de_DE.json