Open up translation docs in separate tab.

lms/templates/modal/_modal-settings-language.html

@@ -53,7 +53,7 @@
 
       <ul class="list list-actions actions-supplemental">
         <li class="list-actions-item">
-        ${_("Don't see your preferred language? {link_start}Volunteer to become a translator!{link_end}").format(link_start='<a class=" action action-volunteer" rel="external" href="https://github.com/edx/edx-platform/blob/master/docs/en_us/developers/source/i18n_translators_guide.rst">', link_end="</a>")}
+        ${_("Don't see your preferred language? {link_start}Volunteer to become a translator!{link_end}").format(link_start='<a class=" action action-volunteer" rel="external" target="_blank" href="https://github.com/edx/edx-platform/blob/master/docs/en_us/developers/source/i18n_translators_guide.rst">', link_end="</a>")}
         </li>
       </ul>
     </div>