Bilingual support and Cross platform Builds

I am in a process to select a best platform for 3D Game development. I have some quries about Cross platform & Bilingual support in Unity3D. Can anybody help me,

1. Do unity3D having Bilingual support ? My game needed to be translated in multiple languages.

2. Do i needed to Code sepperatly for each platforms ?. Ie, If i needed to build my game on Desktop, Web, Windows Phone, Android & Iphone can i makes builds for all these platform with the same code. Do i needed to specify any screen resolution or any other changes while making builds for each platforms ?

3.What are the supported 3D object Formats in Unity 3D.

4.Can i make 3D object within the Unity 3D IDE

1. found that there is a free version and a paid version of unity3D. If i purchased paid version can i get any additional features in the Unity3D IDE.?