Discuss i18n options

[acka47]

From #432 (comment):

i18n: Adding the name property for persons and projects/products, I used two different approaches: language maps for products/projects as we want to list German and English names and just a key for persons as we do not intent to add a person's name in different languages. However, this would result in two different schemas for the same property. One way towards a common approach would be to use different files per language (and indicating the file's @language in the context) instead of one file per entry with language maps. Then we wouldn't have to use language maps at all.