Since the deployment of the last MediaWiki version (1.28-wmf.9), edit summaries are no longer italicized on some places. They ARE italicized on history pages, recent changes page, etc., but they are no longer italicized on log entries and diff pages.
I find it very irritating. Since edit summaries are not italicized, I can't easily recognize them. The deletion log, for example, has a lot of text, and since all the text is formatted the same, It's difficult to recognize the deletion summaries. Previously the deletion summary was italic, so the design was better and I didn't have to look for the summary, because the italicization made my eyes recognize it easily.
Is this an intentional change or a bug? I know it can be fixed by a personal CSS change, but it annoys other users as well.