English teacher a good job?

how safe is it to be an english teacher in japan, when you talk about salary, working hours and chances to don't lose your job? And do you have to stay in Tokyo or can you do it everywhere in Japan? Which education do I need to teach professional (at a School as a normal teacher who does not have to change his workplace all the time)? Is it also possible to teach other more languages than english at schools (german, french for example) or do japanese people don't want to learn these languages. And are the working conditions as bad as in some japanese enterprises?

chances to don't lose your job?
Which education do I need to teach professional?

It's not really a matter of education - professional-level English schools are generally looking for native speakers of English.

I'd strongly suggest that you instead look for teaching jobs in whatever your native language is.