As far as I can tell these two strings are not used on the front end anywhere but they should have the same value in the front end and the admin. Looks like when they were updated to be megabytes the strings were not updated
COM_MEDIA_FIELD_MAXIMUM_SIZE_DESC="The maximum size for an upload (in megabytes). Use zero for no limit. Note: your server has a maximum limit."
COM_MEDIA_FIELD_MAXIMUM_SIZE_LABEL="Maximum Size (in MB)"
I have tested this item✅ successfully on e570fde
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