"The crowds speak Spanish."
Translation:Turbae hispanice loquuntur.
There's a category of verbs, called "deponent verbs," which use (what look like) passive forms but have active meanings. They can be recognized by the fact that their principal parts, in dictionary listings, are all passive.
So, this verb "to speak," is listed as: loquor, loquī, locūtus sum. (The 3 forms meaning: I speak, to speak, I spoke.)
Other common verbs of this type are sequor, sequī, secūtus sum, to follow; hortor, hortārī, hortātus sum, to encourage, exhort; vereor, verērī, veritus sum, to fear; patior, patī, passus sum, to endure, suffer (whence words like patient, passive, passion).