Add localisation

[Tc-Fast]

Currently FMUs contain files (documentation, license, modelDescription, etc.) in a single language. The language used is usually english.
I would like to add full localisation to the FMUs (e.g. german and english).

[otronarp]

For reference, here is the relevant section in the Modelica specification on how it's done there https://specification.modelica.org/master/packages.html#multilingual-descriptions