add privacy policy checkbox

views/DE/account/registration.pug

@@ -61,6 +61,11 @@ html(lang="de")
                         input#inputIndustry(name="inputIndustry", type="text", class="form-control", placeholder="Branche", maxlength="45")
                     div(class="form-group")
                         input#inputSpeciality(name="inputSpeciality", type="text", class="form-control", placeholder="Fachgebiete", maxlength="100")
+                    div(class="pt-2 mb-3 form-check")
+                        input(class="form-check-input" type="checkbox" id="privacyPolicy" name="privacyPolicy" required)
+                        label(class="form-check-label" for="privacyPolicy")
+                            | Ich akzeptiere die <a href="#">Datenschutzerklärung</a>. *
+
                     p <em><small>* Pflichtfeld</small></em>
                     input#submitBtn(type="submit", class="btn btn-outline-dark btn-block", value="Senden" disabled)
                 br