So, both the errors above are present even when using the latest French translation?
If you can search for the "source" string, something should be there under:
- "Shut Down..."
- "This system will be automatically shut down in %d seconds"
That file can be opened in a text editor or tool like Poedit. The PO could be compiled into MO format (either with local or online tools), but I thought both would equally work.