But what if humans will never be able to comprehend alien languages? There's no magically high-advanced all-knowing super-fast translator, no possibility of a shared written form of communication and many aliens don't have appendages that can move as needed for a complicated sign language.
That doesn't stop the humans from talking.
(Just another reason why it's normally recommended to always have at least two humans on every vessel. By now everyone in the galaxy knows they are social creatures.)
Humans just constantly babbling, even though nobody understands them. Empathetic aliens might be able to deduce a humans wants and needs from the tone of their talking, whilst others answer their humans nonsensically. (Like a talkative cat that confesses its war crimes to you while you make kissy noises at it.)
Humans are nothing if not creative. Some tend to hold entire conversations with their alien friends by drawing out what they want to say. (This certainly works best if the particular human has creative talents, but thankfully some aliens are able to interpret even the wonkiest of stick figures.)
With pen and paper missing in certain situations - for example right before a battle when a human is trying to explain their plan to their comrades - some humans have acted out entire scenarios with little figures or objects at hand.
Buttons. Humans are trained to communicate with buttons. This depends entirely on the human's willingness to engage with others. Some are quicker to remember the buttons' meanings than others. Some humans carry around little journals where they've written down what each color-coded button means. Looking it up might take a while.
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