Titles in app are wrong

[LeandraH]

Describe the Bug

Some of the titles in the app are incorrect, e.g. using the path in the categories.

Steps to Reproduce

1. Go to the app in Augsburg / DE
2. Click on 'Willkommen in Augsburg'
3. Click on 'Interessantes über Augsburg'
4. See that the header shows the path instead of the previous title

Other problems:

1. Go to Events
2. Click on any event
3. See that the header shows 'events'

Expected Behavior

In case one, the previous page's title should be shown.
In case two, events should have been translated correctly.

Actual Behavior

We get the path or the untranslated name of the page (which might also be the path?)

Additional Information

Probably came about in #2910