Well the official language is Portuguese, so i would assume no
Huh. Well none of us know exactly how you approach, but.....
- "I have a boyfriend" is the easiest rejection possible, she's allowed to turn you down without it even being your fault, thus keeping your self esteem intact. "I'm too just busy" or "i'm not looking for" whatever is the same thing. All of this is easier to say than "i'm not interested in you" or "you aren't my type". Yes, they're all effectively rejections, don't take them personal.
- I've never used the word "date" while setting up a date. If you ask a girl to go somewhere, it should 100% already be implied that you're going on a date. So you can just casually ask her somewhere and omit the word. Not only does it escalate the request too much, It comes off as inexperienced and tryhard when you have to specify that your outing is going to be a date.
Now, a girl calling your attempt "Sweet and Brave" almost nearly sounds patronizing. This is just her way of saying that she did not get the vibe that you were approaching her as a potential sexual mate...."I have a boyfriend" is an infinitely better rejection than this.
As an experiment, try approaching the next few girls with the mindset that her going somewhere with you is something they she already wants to do, but she just isn't aware of it yet.