[Fix] UI bugs, Registrations Mail, BTRules Popup, Legacy API fixes (#309)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#309

templates/index/index.html

@@ -176,8 +176,8 @@
                       href="#"
                       class="example-link hover:text-primary cursor-pointer"
                       title="load example"
-                      @click.prevent="loadExample('CC(C)CC1=CC=C(C=C1)C(C)C(=O)O', $el)"
-                      >Ibuprofen</a
+                      @click.prevent="loadExample('COC(=O)[C@H](CC1=CC=CC=C1)NC(=O)[C@H](CC(=O)O)N', $el)"
+                      >Aspartame</a
                     >
                   </div>
                   <a