'title.send_invoice' => 'Rechnung senden',
'title.charts' => 'Diagramme',
'title.projects' => 'Projekte',
+// TODO: translate the following.
+// 'title.project_files' => 'Project Files',
'title.add_project' => 'Projekt anlegen',
'title.edit_project' => 'Projekt bearbeiten',
'title.delete_project' => 'Projekt löschen',