"Företaget är tyskt."

Translation: The company is German.

[feathersorblades]

Is seems strange to add a -t at the end of "tysk"

[Mr_Eyl]

Not at all. 'Ett företag' is a neuter noun, so all adjectives used to describe it (unless they're plural) take -t at the end.

Have you been reading the tips and notes before each lesson?

[smailVatan3]

In Swedish, don't they make the first latter of the counrty's name with the capital latters ?

[devalanteriel]

Yes, but this isn't the name of the country - it's the adjective. Swedish doesn't capitalise that.