Rework property to handle language code / translations

[alexgarel]

In the property table, we have some property that are localized. They end with a colon and the language code. Eg. description:en, description:fr, etc.

Currently we just display them in the table, but it would be better to:

• be able to see on is the translation of the other
• hide properties in languages that should not be shown (according to selected languages)
• be able to easily add a translation in a language for the property

Tasks:

• define the UX
• implement it (frontend/react)

I don't think it require any backend dev, but I'm unsure about it.