Create zh_CN.po

Add a Chinese (Simplified) Translation.
Italian translation: update
automatic reordering shenanigans
Merge branch 'ansa89-italian-translation'
Merge branch 'master' of https://github.com/kaisfm/Venom
added zh_CN.po to build system
Add Spanish translation
updated cmakelists file and automatic msgmerge reordering of es.po
Merge branch 'oxichem-master'
updated vapi to newest toxcore
merge master with av