So for post #2489071 I particularly noticed the characters had a Austrian or British dialect. However, when I tried to look for tags relating to that dialect and dialects in general I found nothing. Either this is hidden under an undefined alias or is entirely new tagging group.

There is a tag for accent and a few tags for specific accents.

I believe that having tags for accents is a good idea, but those would need to be populated to be useful.