Separate stats and achievs pages (#7804)

* separate stats and achievs tabs, move 'enable class system' button to stats

* move stats layout stuff from profile.jade to stats.jade

* shuffle stats page into more columns

* separate stats and achievs in expandable navbar submenus

* add multiple options for stats.jade: col1, col2, all; fixes weirdly crowded members modal

* make stats and achievs strings consistent

* remove mobile checks in profile.jade

* fix merge issue

website/views/shared/header/menu.jade

@@ -17,6 +17,8 @@ nav.toolbar(ng-controller='MenuCtrl')
                 a(ui-sref='options.profile.backgrounds')=env.t('backgrounds')
               li
                 a(ui-sref='options.profile.stats')=env.t('stats')
+              li
+                a(ui-sref='options.profile.achievements')=env.t('achievs')
               li
                 a(ui-sref='options.profile.profile')=env.t('profile')
             ul.toolbar-submenu
@@ -91,6 +93,8 @@ nav.toolbar(ng-controller='MenuCtrl')
               a(ui-sref='options.profile.backgrounds')=env.t('backgrounds')
             li
               a(ui-sref='options.profile.stats')=env.t('stats')
+            li
+              a(ui-sref='options.profile.achievements')=env.t('achievs')
             li
               a(ui-sref='options.profile.profile')=env.t('profile')
       li.toolbar-button-dropdown