Since ImageData (https://world.episerver.com/csclasslibraries/cms/EPiServer.Core.ImageData) is not translatable we need to translate same descriptions and alternative texts over and over again in multiple locations, blocks, pages etc. where ever the image is used.
Issue is even more relevant now, that most governments require sites to be accessible.
There has been conversation about this missing feature over the years on Episerver World:
Would it be possible to re-design media types, so that those will also implement ILocalizable? Based on the response from support issue is following:
You can check the class structure of ImageData and there's a Blob properties. This means the object can perform streaming and file read/write and this obviously cannot implements ILocalizable.
Which means that probably media types should be wrapped to something to allow ILocalizable?