Bug #1702615: Improve color contrast for link color in the Modern theme

Change-Id: I0e4319329d6ed4b5b18dcff7cf0523a9dfc6db25
behatnotneeded: Style change only

htdocs/theme/modern/sass/_custom.scss

@@ -12,3 +12,8 @@
     color: $state-danger-text;
   }
 }
+
+// Lighten the Administration link in the menu bar in the admin area
+div.admin-title a {
+  color:#4DB1D6;
+}

htdocs/theme/modern/sass/utilities/_bootstrap-variables.scss

@@ -60,7 +60,7 @@ $body-bg:               #fff;
 $text-color:            $theme-text-color;
 
 //** Global textual link color.
-$link-color:            #4DB1D6;
+$link-color:            #1f6c88;
 //** Link hover color set via `darken()` or `lighten()` function.
 $link-hover-color:      darken($link-color, 5%);
 //** Link hover decoration.