I have these 2 files:
msgid "Categories"
msgstr "Categories"
msgid "Dashboard"
msgstr "Dashboard"
And:
msgid "Categories"
msgstr "Categorías"
msgid "Dashboard"
msgstr "Dashboard"
I don't have the "# fuzzy" line. But, executing without force, it says that is fuzzy and exit.
I have read this:
Flask Babel - 'translations/de/LC_MESSAGES/messages.po' is marked as fuzzy, skipping
But in that case the user contains the #, fuzzy line. I don't have that line
Response compilations says that the files are marked as fuzzy.
This is my project structure:
Project structure
¿Any new idea different from use -f?

It was a problem with my local environment.
Updated setuptools and now is working well.