Mark 4 strings translatable

[ghost]

4 strings marked translatable

• "Delete Note?"
• "This action cannot be undone. If you want to hide the note, you can close it instead."
• "Cancel"
• "Delete"

[vixalien]

I think you'd also need to update potfiles, by running ninja sticky-notes-update-po

[ghost]

please update the potfiles

Due to some gjs error, I uptated the pot file maunaly.