change name for bc dates

website/templates/_help.html

@@ -111,8 +111,8 @@
           </div>
 
 <div class="accordion-group">
-            <div class="accordion-heading"><a data-toggle="collapse" data-parent="#accordion-faq" href="#faq-18" class="accordion-toggle collapsed">How do I add B.C. dates?</a></div>
+            <div class="accordion-heading"><a data-toggle="collapse" data-parent="#accordion-faq" href="#bc-dates" class="accordion-toggle collapsed">How do I add B.C. dates?</a></div>
-            <div id="faq-18" style="height: 0px;" class="accordion-body collapse">
+            <div id="bc-dates" style="height: 0px;" class="accordion-body collapse">
               <div class="accordion-inner">You can add B.C. dates by using negative years. For example, -100 would be 100 B.C. Be sure to change the formatting of the cell you want to modify to Plain Text — "Format > Number > Plain Text".</div>
             </div>
           </div>