Translate humanFileSize in other languages

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Is your feature request related to a problem? Please describe.
The filesize unit in humanFileSize is not translated. Other languages use other abbreviations than KB or GB.

Describe the solution you'd like
Adding these strings to the translation system.

Describe alternatives you've considered
Leaving it as is

Additional context
Please bear in mind that in some situations the reverse is done later, 2GB is turned back into a number of bytes.
So, a deeper analysis is needed, to look into usage of the method and whether it would be acceptable to add translation to it, or whether it's needed to add a second method or a parameter for a localized version.

Start by locating the humanFileSize method and the translation system, then inspect every usage of the method to identify places where its output is later converted back into bytes. Done means determining whether localized units are safe throughout those usages and documenting or implementing the appropriate translation approach, including any needed separate method or parameter.