They donīt normally hire forgein pilot unless you know to speak spanish and you have our on type (b737/emr190).
Try to apply in any german, french speaking country, the will say the same.
English is the main language for aviation, you need to know speak, but for operations and other staffs involved with the company is important to speak spanish.
That is a problem with many people who donīt want to learn another language because they are a lazyyass so they think that all the world know to speak english.