MD Settings: Polish languages pages.

chrome/browser/resources/settings/settings_shared_css.html

 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style>
       :root {
         --checkbox-margin-start: 2px;
         --checkbox-size: 16px;
         --checkbox-spacing: 18px;
         --iron-icon-fill-color: var(--paper-grey-600);
         --iron-icon-height: 20px;
@@ skipping 134 matching lines @@
         @apply(--layout-center);
         display: flex;
         min-height: 40px;
         padding: 0;
       }
 
       .list-item.underbar {
         border-bottom: 1px solid var(--paper-grey-300);
       }
 
+      .list-item.selected {
+        font-weight: 500;
+      }
+
       .list-item select {
         -webkit-margin-start: 4px;
       }
 
       .list-item > .middle {
         flex: 1;
         margin: 8px 12px;
         overflow: hidden;
         white-space: nowrap;
       }
@@ skipping 80 matching lines @@
 
       .settings-checkbox-spacer {
         -webkit-margin-start: calc(
             var(--checkbox-margin-start) +
             var(--checkbox-size) +
             var(--checkbox-spacing));
       }
     </style>
   </template>
 </dom-module>