Rejoining / Languages
If you want to rejoin, contact the Cabin Crew Service Center and ask for a rejoining form, as easy as that! Although, my friend who resigned before end of probation wasn't accepted back. I hope that when you resigned you explained your situation, if so - no problem!
Only english is important, any additional language is a benefit, but they wont chose people who speak several languages over only english speaking people. There are many Aussies and British in the company! Don't list a second language if you are not a hundred percent convinced that you could handle ANY situation. They will find out and you will be in trouble. I have seen it by myself! If they need certain language speakers (arabic, chinese, french etc.) they will go to this regions.