Simplify titles for group settings sections

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/groups/edit.html.haml

@@ -6,7 +6,7 @@
 %section.settings.gs-general.no-animate#js-general-settings{ class: ('expanded' if expanded) }
   .settings-header
     %h4
-      = _('General group settings')
+      = _('General')
     %button.btn.js-settings-toggle{ type: 'button' }
       = expanded ? _('Collapse') : _('Expand')
     %p
@@ -28,7 +28,7 @@
 %section.settings.gs-advanced.no-animate#js-advanced-settings{ class: ('expanded' if expanded) }
   .settings-header
     %h4
-      = _('Advanced settings')
+      = _('Advanced')
     %button.btn.js-settings-toggle{ type: 'button' }
       = expanded ? _('Collapse') : _('Expand')
     %p