One template to rule them (almost) all

A bit of refactoring in the templates because a large part of this site’s content is of the same type.
Previously, two templates were used for standard content:
One template was used to display elements with a title, such as articles, changelogs, and bookmarks. And another template was used for elements where the title should not be displayed, such as notes. These templates are now a single template, but with an option to display the title or not.
Jams and photos, however, retain their specific templates because they are content with a different structure.