Implement multi-language support for MultiLanguage textes everywhere
Currently only a few multi-language attributes are really supported by the Editor. These are TextData.multilanguageText and TaxonNode.excludedNote. A similar implementation also exists for term representations.
Not yet implemented is:
Some of them are even not yet implemented as simple fields.
On model side we should also check if it is not possible now to use the existing eu.etaxonomy.cdm.model.common.MultilanguageText class. Long time ago hibernate did not support this due to a hibernate bug or missing feature.