Add optional learningMaterial field to ChallengeTask model for additional educational content; update API endpoints, TypeScript interfaces, and frontend forms to support this feature. Enhance localization for English and Russian to include new field descriptions and placeholders.

src/__data__/kc.ts

@@ -3,6 +3,6 @@ import Keycloak from 'keycloak-js'
 export const keycloak = new Keycloak({
   url: KC_URL,
   realm: KC_REALM,
-  clientId: KC_CLIENT_ID,
-});
+  clientId: KC_CLIENT_ID
+})