Finish adding support for SPA operation

.../apps/alsijil/assets/components/coursebook/CourseBook.vue

aleksis/apps/alsijil/assets/index.js

aleksis/apps/alsijil/assets/messages/de.json

aleksis/apps/alsijil/frontend/UpdateStatuses.js

...pps/alsijil/frontend/components/coursebook/CourseBook.vue

...alsijil/frontend/components/coursebook/CourseBookList.vue

...il/frontend/components/coursebook/LessonDocumentation.vue

...l/frontend/components/coursebook/LessonDocumentations.vue

.../alsijil/frontend/components/coursebook/PersonalNotes.vue

...lsijil/frontend/components/coursebook/UpdateIndicator.vue

...tend/components/coursebook/alsijilSitePreferences.graphql

...l/frontend/components/coursebook/courseBookLesson.graphql

...ponents/coursebook/courseBookLessonDocumentations.graphql

.../frontend/components/coursebook/courseBookLessons.graphql

...lsijil/frontend/components/coursebook/excuseTypes.graphql

...alsijil/frontend/components/coursebook/extraMarks.graphql

...rontend/components/coursebook/lessonDocumentation.graphql

aleksis/apps/alsijil/frontend/index.js

aleksis/apps/alsijil/frontend/messages/de.json

aleksis/apps/alsijil/frontend/messages/en.json