Languages

No, without prior work experience, you can apply to courses in Germany. But, for some courses, they do keep a requirement of minimum 1 year experience. It basically depends on the course. The main thing Universities look into is your GPA. If you have good GPA, then consider that your 50% of admission is assured. Rest depends on profile like skill sets developed, internships, projects handled and incase of some courses (the number of journals published)
In general, the Universities look into your GPA, your TOEFL/IELTS Score, Your SOP and LOR's obtained. If you have Good GRE score, it improves your chances. But, it is not mandatory. Also, having knowledge in German helps to increase your chances, especially in courses where there is German electives. You need B-1 level German.

If you are aspiring to be a pilot, then it will not be of any major use, because you will be flying in an environment where English will be majorly used for almost all the communication. Radio Telephony and ATC communications will require usually English and you may also communicate in French, but only when you fly in French airspace. Now, if you are aspiring to be a cabin crew, then French will be helpful, because cabin crew directly interact with the passengers and many passengers who are of French origin would not know English. So, communication with them would become easy and flawless, if you can speak in their language. This would enhance understanding them better and making their journey more comfortable.