[Frontend/PLATFORM] Cherry picking from platform changes in vista65

open #95
vista #65
scss and html mods for VISTA-related elements;
(cherry picked from commit 6ef3987)

platform/commonUI/general/res/sass/controls/_buttons.scss

@@ -41,6 +41,10 @@ $pad: $interiorMargin * $baseRatio;
         vertical-align: top;
     }
 
+	&.lg {
+		font-size: 1rem;
+	}
+
     &.sm {
         padding: 0 $pad / $baseRatio;
     }