Translation:We are teachers.
We are masters? why not
I guess when we're finished with the course we might be...
Yeah, I don't understand why it's wrong if I say masters :/ Cost me heart!
Masters is a valid translation. Click on the "Report A Problem" button and report it.
Is it possible to simply say "somos maestros"?
Yes, "nosotros" isn't necessary and native speakers wouldn't say it unless they wanted to put emphasis on the fact that WE are the teachers!
yes, that means we are teachers
what if we are teachers and all of us are women? do we still have to build the sentence masculine?
The word is maestro/maestra. See my reference above to a good online dictionary. Using the dictionary is a vital habit to get into and there is a lot more information on the WordReference/Collins website than just the simple words.