Ui improvements (#5948)

* PLT-5849 - Code block wrap on IOS

* PLT-5972 - Comment has first line indented

* PLT-6048 - Adjusting UI for link previews

* PLT-5733 - Adding error text theme option

webapp/sass/layout/_forms.scss

@@ -69,8 +69,10 @@
         color: $red;
     }
 
-    .control-label {
-        color: inherit;
+    .form__label {
+        &.control-label {
+            color: inherit;
+        }
     }
 
     &.radio,