make language an optional parameter for createUser and do not set it on the elopage webhook

backend/src/graphql/arg/CreateUserArgs.ts

@@ -15,7 +15,7 @@ export default class CreateUserArgs {
   password: string
 
   @Field(() => String)
-  language: string
+  language?: string
 
   @Field(() => Int, { nullable: true })
   publisherId: number

backend/src/graphql/resolver/UserResolver.ts

@@ -280,7 +280,7 @@ export class UserResolver {
     // default int publisher_id = 0;
 
     // Validate Language (no throw)
-    if (!isLanguage(language)) {
+    if (!language || !isLanguage(language)) {
       language = DEFAULT_LANGUAGE
     }
 

backend/src/webhook/elopage.ts

@@ -150,7 +150,6 @@ export const elopageWebhook = async (req: any, res: any): Promise<void> => {
         firstName,
         lastName,
         password,
-        language: 'default',
         publisherId: loginElopgaeBuy.publisherId,
       })
     } catch (error) {