If I make a de.po file in my modul directory i18n I can't see the translation after installation in odoo.

I have tried to reload the language and to Synchronize Terms the language "German"

Have anyone a fix for this issue?

Here a example of my de.po file:

Sometime a few are translatet, but not all....

#. module: test_module
#: model:ir.actions.act_window,name:project.view_task_kanban
msgid "Tasks"
msgstr "Aufgabe"