File size messages
MediaWiki:Size-gigabytes/en currently reads "$1 GB" but the explanation clearly states:
Size (of a file, typically) in gibibytes (1 gibibyte = 1024×1024×1024 bytes).
So the text really should be "$1 GiB"
Similarly, MediaWiki:Size-kilobytes/en should be "$1 KiB" and MediaWiki:Size-megabytes/en should be "$1 MiB". See for instance https://en.wikipedia.org/wiki/Binary_prefixes
Hi. I've answered you at bugzilla:52687 because it's a wider discussion.