Flask Framework Cookbook - Second Edition

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Next time, if we need to update the translations in our messages.po file, we do not need to call the init command again. Instead, we can run an update command, which is as follows:

    $ pybabel update -i my_app/messages.pot -d my_app/translations

After this, run the compile command as usual.

It is often preferable to change the language of a website based on the user IP and location (determined from the IP). However, this is regarded as an inferior way of handling localization as compared to the use of the accept-language header, as we did in our application.