When adding a title that is in a foreign languge, follow these basic rules regardless of citation style:
For German, capitalize the first word and all nouns.
For French, capitalize THROUGH the first noun in the title.
For Italian and other languages, capitalize just the first word.
(NOTE: Always capitalize all proper nouns.)
See page 72-75 in the MLA Handbook 8th edition for more information about capitalizing non-English words.
The MLA Handbook was most recently updated in 2016. It gives step-by-step advice on every aspect of writing papers, from selecting a topic to submitting the completed paper. It provides an authoritative presentation of MLA documentation style for use in student writing.
The most recent edition of the MLA Handbook is kept on the Reference shelves at Rickman Library.
MLA Handbook, 8th edition. New York: MLA, 2016.