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Any spell that is language dependent requires that the target of the spell can both hear you and understand what you're saying for the spell to have any effect; these spells, naturally, also have a verbal component.
Silent Spell removes the verbal component from any spell cast.
Since you're casting a spell without saying anything, wouldn't that mean you can also bypass the language dependence of the spell as well?

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Generally, no.
Silent Spell removes the Verbal component of the casting components of the spell. [language dependent] spells are indicated as such because you must communicate with the target as part of the effect of the spell. While Silent Spell allows the component to be bypassed, it doesn't bypass the need to communicate.
Using the spell Command as an example, the word that you give as a command is both the Verbal component, and it must be understood. If you cast a Silent Command, you can do so without verbalizing the command, but the creature has then failed to understand the language dependent aspect of this...since you didn't say anything. The caster succeeds in casting the spell, but the target can't understand the silent command.
Situationally, there may be some circumstances where a Silent language dependent spell works, but the caster has a means of communicating, such as through telepathy or some variation of a non-spoken language, where the Silent version of the spell still reasonably works.