ui: update styling of comment headers and role labels (#6816)

## Changes

* same as https://codeberg.org/forgejo/forgejo/pulls/6201, but for role labels
    * remove border
    * decrease paddings
    * all by simply removing `basic`
    * I did check that no important properties were added by that class
* make the header itself more compact by decreasing paddings here too
    * it's really large currently - being as high as single line content
* removed "review" label by @fnetX request

There was no heavy consideration behind these changes. I was just poking around the area from time to time and finally decided to submit something. If you think there's more consideration needed, please tell!

## Preview

![b1.webp](/attachments/626a8c26-ba21-4920-810e-2bd924997cdb)

![b2.webp](/attachments/389995d3-70d2-480f-8c75-56c59a659569)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6816
Reviewed-by: Beowulf <beowulf@beocode.eu>
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: 0ko <0ko@noreply.codeberg.org>
Co-committed-by: 0ko <0ko@noreply.codeberg.org>

options/locale/locale_en-US.ini

@@ -1831,7 +1831,6 @@ issues.review.remove_review_request_self = refused to review %s
 issues.review.add_remove_review_requests = requested reviews from %[1]s and removed review requests for %[2]s %[3]s
 issues.review.pending = Pending
 issues.review.pending.tooltip = This comment is not currently visible to other users. To submit your pending comments, select "%s" -> "%s/%s/%s" at the top of the page.
-issues.review.review = Review
 issues.review.reviewers = Reviewers
 issues.review.outdated = Outdated
 issues.review.outdated_description = Content has changed since this comment was made