Calendar/Date localization

New: Choose calendar starting day of week
New: Choose prefered date/time formats
New: Option to disable relative dates and show absolute dates instead

src/UI/Settings/settings.less

@@ -109,6 +109,10 @@ li.save-and-add:hover {
 }
 
 .settings-tabs {
+  li>a {
+    padding : 10px;
+  }
+
   @media (min-width: @screen-sm-min) and (max-width: @screen-md-max) {
     li {
       a {