added new primary button variables

Author: Karlasa

lib/web/css/source/lib/_buttons.less

@@ -276,6 +276,9 @@
 //  ---------------------------------------------
 
 .lib-button-primary(
+    @_button-font-family: @button-primary__font-family,
+    @_button-font-size: @button-primary__font-size,
+    @_button-font-weight: @button-primary__font-weight,
     @_button-line-height: @button-primary__line-height,
     @_button-width: @button-primary__width,
     @_button-margin: @button-primary__margin,
@@ -299,6 +302,9 @@
     @_button-gradient-direction: @button-primary__gradient-direction
 ) {
     .lib-button(
+        @_button-font-family: @_button-font-family,
+        @_button-font-size: @_button-font-size,
+        @_button-font-weight: @_button-font-weight,
         @_button-line-height: @_button-line-height,
         @_button-width: @_button-width,
         @_button-margin: @_button-margin,