TCEforms Refactoring

TCEforms should be able to handle multiple languages.

This will at least require these changes:

• elements need to be aware of their language
  • is it a problem if two or more elements with the same name and different languages exist?
  • rendering has to respect the language and print the corresponding flag
• the formbuilder must handle the different languages
• identifiers have to be built in a way that different languages are respected (this is easy to implement in the Element_Abstract function)
• diff views have to be implemented (this is still unclear)
• the flexform data structure information about localization has to be stored inside the data structure (or the FlexForm object) -> the DS class has to be extended, maybe we should create a FlexFormDataStructure class

As for the two different types of localization, we may handle them this way:

1. langChildren = 0: (= Localization on Record level) Create a different record object for each language
2. langChildren = 1: Create one record object that knows about the different languages it has to handle. Maybe we have to create a special FormBuilder for this record.