Allow to extend Field string and help
In some cases, we need to update to the string or help text of a field (ex: msg41279).
My idea is the use a specialized sub-class of str which can remember how it was constructed. In this case we can create an ir.translation record for each part of the string. And to get the translated version, it is recomposed from translated parts.
The only drawback is that such composition may not follow the language structure. But I'm not sure such language exists.