refactor out OrganizationForm; share between add & edit

src/util/validators.js

@@ -0,0 +1,19 @@
+import { i18nMark } from '@lingui/react';
+
+export function required (message) {
+  return value => {
+    if (!value.trim()) {
+      return message || i18nMark('This field must not be blank');
+    }
+    return undefined;
+  };
+}
+
+export function maxLength (max) {
+  return value => {
+    if (value.trim() > max) {
+      return i18nMark(`This field must not exceed ${max} characters`);
+    }
+    return undefined;
+  };
+}