"I like French and German."

Translation: Tôi thích tiếng Pháp và tiếng Đức.

[btopps]

Is this referring to the languages or the countries?

[TehVanarch]

Tiếng means "language" in this case (it can also mean: sound, noise, reputation/notoriety/fame and hour).

[ThomasGesc1]

Both language and people is the correct translation.
Tôi thích người Pháp và người Đức.
Should be accepted as well.

[ComradeH]

German language is not easy though

[PaulGerrar6]

Another guessing game. Guess the nouns. Maybe people, wine, art, architecture, ... ah ... it is language.