babel.md

install

pip install flask-babel

from flask_babel import Babel

def get_locale():
    # if a user is logged in, use the locale from the user settings
    user = getattr(g, 'user', None)
    if user is not None:
        return user.locale
    # otherwise try to guess the language from the user accept
    # header the browser transmits.  We support de/fr/en in this
    # example.  The best match wins.
    return request.accept_languages.best_match(['de', 'fr', 'en'])

def get_timezone():
    user = getattr(g, 'user', None)
    if user is not None:
        return user.timezone

babel = Babel(app, locale_selector=get_locale, timezone_selector=get_timezone)

using translation

from flask_babel import gettext, ngettext, lazy_gettext

class MyForm(formlibrary.FormBase):
    success_message = lazy_gettext(u'The form was successfully saved.')

gettext(u'A simple string')
gettext(u'Value: %(value)s', value=42)
ngettext(u'%(num)s Apple', u'%(num)s Apples', number_of_apples)

create a 'babel.cfg' file

[python: **.py]
[jinja2: **/templates/**.html]

files to compile

pybabel extract -F chrono_des_vignes/babel.cfg -k lazy_gettext -o chrono_des_vignes/messages.pot .

create a po file for each language (de in this example)

pybabel init -i chrono_des_vignes/messages.pot -d chrono_des_vignes/translations -l de

after editing this file compile the traslations

pybabel compile -d chrono_des_vignes/translations

when string change :

• update the cfg file
• create a new messages.pot

pybabel extract -F chrono_des_vignes/babel.cfg -k lazy_gettext -o chrono_des_vignes/messages.pot .

• uptadte all po files and copliled files

pybabel update -i chrono_des_vignes/messages.pot -d chrono_des_vignes/translations

after editing this file compile the traslations

pybabel compile -d chrono_des_vignes/translations

dev must do

• display all languages
• add language
• change translation
• updates cfg and pot and all translations