feat: improved registration signup flow (#1188)

refactored signup flow for entire registration process. Utilized seed data option for optional seeding of Foods, Units, and Labels. Localized registration page.

frontend/api/public/validators.ts

@@ -0,0 +1,32 @@
+import { BaseAPI } from "../_base";
+
+export type Validation = {
+  valid: boolean;
+};
+
+const prefix = "/api";
+
+const routes = {
+  group: (name: string) => `${prefix}/validators/group?name=${name}`,
+  user: (name: string) => `${prefix}/validators/user/name?name=${name}`,
+  email: (name: string) => `${prefix}/validators/user/email?email=${name}`,
+  recipe: (groupId: string, name: string) => `${prefix}/validators/group/recipe?group_id=${groupId}?name=${name}`,
+};
+
+export class ValidatorsApi extends BaseAPI {
+  async group(name: string) {
+    return await this.requests.get<Validation>(routes.group(name));
+  }
+
+  async username(name: string) {
+    return await this.requests.get<Validation>(routes.user(name));
+  }
+
+  async email(email: string) {
+    return await this.requests.get<Validation>(routes.email(email));
+  }
+
+  async recipe(groupId: string, name: string) {
+    return await this.requests.get<Validation>(routes.recipe(groupId, name));
+  }
+}