So it is the fault of the author of Basil theme?
I don’t know, because I need to see the theme.
But loco translate in the source (pot) does not take the header.php file that is in _theme / parts where I have to add it?
I have said several times that if you have a POT file, you do not need to care about the source code.
But on Basil.pot there is “Profile” “Sign Out” and “Sign In” I must send it ?
Send what? where?
As we’ve agreed the is file is fine, and Loco Translate can perfectly well create PO/MO files from it.
Until now I used POedit
Then continue using it. You will find they both do the same thing – edit files. Editing files does not seem to be your problem.
Unless you can post a download link to your theme, I have nothing more I can contribute here. After 18 replies we are no closer to sorting this out.