if you are fluent to native level in some harder to learn languages - japanese, chinese, arabic, russian, (types of) indian etc , so can speak and write in that language as though it were your first language, and you have some practical skills in a work environment, or a degree... getting a job shouldnt be too hard
french, spanish, german, italian etc. - all the very obvious european languages aren't as high in demand anymore, most kids are coming out of school knowing alot more in languages than they used to, speaking these languages can still make it abit easier to get a job, but even being completely fluent in them wont have employers fighting over you
im a fluent french speaker, its basically my 2nd language, every application that i put out i will put i can talk french to native level, and honestly, employer's dont seem to care much about it, although, i havent been applying for jobs where foreign language is a requirement, nor do i really 'emphasise' on my CV just how fluent i am in french, i grew up with the same impression that being able to speak french would make plenty of employers want me