diff --git a/aleksis/apps/alsijil/frontend/components/Coursebook.vue b/aleksis/apps/alsijil/frontend/components/Coursebook.vue
index 2a2988867f4e04a146f481e014b890f933618781..2300a00b9c47eae1222449d4ffe7717855f313fe 100644
--- a/aleksis/apps/alsijil/frontend/components/Coursebook.vue
+++ b/aleksis/apps/alsijil/frontend/components/Coursebook.vue
@@ -160,11 +160,10 @@ export default {
       };
     },
     selectable() {
-      // TODO: i18n
       return [
-        { header: "Klassen" },
+        { header: this.$t("alsijil.coursebook.filter.groups") },
         ...this.groups.map((group) => ({ type: "group", ...group })),
-        { header: "Kurse" },
+        { header: this.$t("alsijil.coursebook.filter.courses") },
         ...this.courses.map((course) => ({ type: "course", ...course })),
       ];
     },
diff --git a/aleksis/apps/alsijil/frontend/messages/de.json b/aleksis/apps/alsijil/frontend/messages/de.json
index a9dbb6b4060f746f9383f3694b1af14a364cfdf1..fea84f3d434a329cf50e7f076d16cf5974dbe1a1 100644
--- a/aleksis/apps/alsijil/frontend/messages/de.json
+++ b/aleksis/apps/alsijil/frontend/messages/de.json
@@ -49,7 +49,9 @@
         }
       },
       "filter": {
-        "own": "Nur eigene Stunden anzeigen"
+        "own": "Nur eigene Stunden anzeigen",
+        "groups": "Klassen",
+        "courses": "Kurse"
       }
     }
   }
diff --git a/aleksis/apps/alsijil/frontend/messages/en.json b/aleksis/apps/alsijil/frontend/messages/en.json
index b009570d78f2257901a5d2e7aaa0e3f94b840891..8a98be2dbfcb4b32cc5f02e2a4a4d69d2332175c 100644
--- a/aleksis/apps/alsijil/frontend/messages/en.json
+++ b/aleksis/apps/alsijil/frontend/messages/en.json
@@ -49,7 +49,9 @@
         }
       },
       "filter": {
-        "own": "Only show own lessons"
+        "own": "Only show own lessons",
+        "groups": "School classes",
+        "courses": "Courses"
       }
     }
   }