correct hindi sentence should be सब जीतना चाहते हैं
Both are correct. "सब जीतना चाहती हैं।" is used when talking about the feminine gender and "सब जीतना चाहते हैं" is used for the masculine gender.
That's right. Our team has tried to use gender neutrality by making the default translations sometimes in the masculine form and other times in the feminine form.