Introduce new color variable for the toggle separator

app/assets/stylesheets/layout/_main_menu.sass

@@ -104,7 +104,7 @@ $toggler-width: 40px
 
           a:not(:only-child):first-of-type
             @extend .small-10
-            border-right: 1px solid $main-menu-font-color
+            border-right: 1px solid $main-menu-toggler-separator-color
 
 
         .open .toggler

app/assets/stylesheets/open_project_global/_variables.sass

@@ -108,6 +108,7 @@ $main-menu-selected-hover-indicator-color:      $primary-color-dark !default
 $main-menu-selected-hover-indicator-width:      4px !default
 
 $main-menu-navigation-toggler-font-hover-color: #FFFFFF !default
+$main-menu-toggler-separator-color:             #EAEAEA !default
 
 $main-menu-child-item-height:                   38px !default
 $main-menu-child-menu-bg-color:                 #FFFFFF !default