I beleive you have your terms confused as I have never seen a Computer Security degree or job posting for such. I beleive by Computer Security you mean Information Security which usually falls under an Information Technology "IT" degree. A Computer Science "CS" degree is usually what programmers get. I have a bachelor's degree in IT with a specialization in Information Security and have been in the industry for over 10 years so based on my experience here are your answers:
1.Is it better to lose a year and change to CS?
If you want to be a programmer and not an IT Security professional then it would be better for you to switch. Most job postings that are looking for a bachelor's degree in Computer Science "CS" are programming gigs or maybe network administrators. If those types of jobs are what you want to do then I would say go for it.
2.Do companies recognize a Computer Security course as a good course? Because I mostly see companies asking for a CS in the requirements.
Please refer to my answer to 1. This really depends on the company and type of position you are applying for. I have seen job postings that are looking for an IT or CS bachelor’s degree. I believe this is because IT and CS degrees are pretty similar but they also have their differences.
3.Is it better to continue in Computer Security and then doing a Masters in CS? Or change right now to CS and do a Master in information security?
The nice thing about Master's degrees is you could do either. You could continue with your Computer Science degree then get a master's in IT Security. Honestly in this field I feel you’re better off getting a Bachelor's degree and getting some work experience under your belt then once you have done that taking certifications like Security + and eventually after you have enough work experience the CISSP. I had many internships and IT jobs while I was getting my IT Security degree. Real world experience will always get you some cred with most employers.
4.How is the outlook for jobs in security for the next years?
There will always be a need for cyber security professionals even more so now days. As long as we have computers and the internet it’s safe to say we will have job opportunities all over the world!
If you'd like me to expand on any of my answers please let me know and feel free to ask as many questions as you like. I hope this helps you :)