Set correct consent text on initial load for renewals (#21)

public/parts/signup.php

@@ -369,7 +369,13 @@ if (isset($_SESSION['familyid']) && $database->has('families', ['familyid' => $_
                 <div class="form-check">
                     <input class="form-check-input" type="checkbox" value="1" name="agree_terms" id="agree_terms" required>
                     <label class="form-check-label" for="agree_terms">
-                        I/We home school our <span id="child_ren">child</span> and have read and understand this application.  We also agree to abide by HACHE’s policy of common courtesy and respect for one another.
+                        I/We home school our <span id="child_ren"><?php
+                            if (count($children) > 1) {
+                                echo "children";
+                            } else {
+                                echo "child";
+                            }
+                            ?></span> and have read and understand this application.  We also agree to abide by HACHE’s policy of common courtesy and respect for one another.
                     </label>
                 </div>