Improve admin UI for account view (#9643)

app/javascript/styles/mastodon/dashboard.scss

@@ -30,15 +30,21 @@
     }
   }
 
-  &__num {
+  &__num,
+  &__text {
     text-align: center;
     font-weight: 500;
     font-size: 24px;
+    line-height: 21px;
     color: $primary-text-color;
     font-family: $font-display, sans-serif;
     margin-bottom: 20px;
   }
 
+  &__text {
+    font-size: 18px;
+  }
+
   &__label {
     font-size: 14px;
     color: $darker-text-color;