Merge remote-tracking branch 'origin/dev' into feat/pagina-om-leerpaden-te-bekijken-#41

# Conflicts:
#	backend/src/controllers/learning-objects.ts
#	frontend/src/controllers/base-controller.ts

frontend/src/controllers/controllers.ts

@@ -2,12 +2,12 @@ import { ThemeController } from "@/controllers/themes.ts";
 import {LearningObjectController} from "@/controllers/learning-objects.ts";
 import {LearningPathController} from "@/controllers/learning-paths.ts";
 
-export function controllerGetter<T>(Factory: new () => T): () => T {
+export function controllerGetter<T>(factory: new () => T): () => T {
     let instance: T | undefined;
 
     return (): T => {
         if (!instance) {
-            instance = new Factory();
+            instance = new factory();
         }
         return instance;
     };

frontend/src/controllers/themes.ts

@@ -5,12 +5,12 @@ export class ThemeController extends BaseController {
         super("theme");
     }
 
-    getAll(language: string | null = null) {
+    async getAll(language: string | null = null): Promise<unknown> {
         const query = language ? { language } : undefined;
-        return this.get<any[]>("/", query);
+        return this.get("/", query);
     }
 
-    getHruidsByKey(themeKey: string) {
+    async getHruidsByKey(themeKey: string): Promise<string[]> {
         return this.get<string[]>(`/${encodeURIComponent(themeKey)}`);
     }
 }