I18n example

Internalize your bot Step 1: extract texts # pybabel extract i18n_example.py -o locales/mybot.pot Step 2: create *.po files. For e.g. create en, ru, uk locales. # echo {en,ru,uk} | xargs -n1 pybabel init -i locales/mybot.pot -d locales -D mybot -l Step 3: translate texts Step 4: compile translations # pybabel compile -d locales -D mybot Step 5: When you change the code of your bot you need to update po & mo files. Step 5.1: regenerate pot file: command from step 1 Step 5.2: update po files # pybabel update -d locales -D mybot -i locales/mybot.pot Step 5.3: update your translations Step 5.4: compile mo files command from step 4

i18n_example.py
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Step 4: compile translations
    # pybabel compile -d locales -D mybot

Step 5: When you change the code of your bot you need to update po & mo files.
    Step 5.1: regenerate pot file:
        command from step 1
    Step 5.2: update po files
        # pybabel update -d locales -D mybot -i locales/mybot.pot
    Step 5.3: update your translations
    Step 5.4: compile mo files
        command from step 4
"""

from pathlib import Path

from aiogram import Bot, Dispatcher, executor, types
from aiogram.contrib.middlewares.i18n import I18nMiddleware

TOKEN = 'BOT_TOKEN_HERE'
I18N_DOMAIN = 'mybot'

BASE_DIR = Path(__file__).parent
LOCALES_DIR = BASE_DIR / 'locales'

bot = Bot(TOKEN, parse_mode=types.ParseMode.HTML)
dp = Dispatcher(bot)

# Setup i18n middleware
i18n = I18nMiddleware(I18N_DOMAIN, LOCALES_DIR)
dp.middleware.setup(i18n)

# Alias for gettext method
_ = i18n.gettext


@dp.message_handler(commands='start')
async def cmd_start(message: types.Message):
    # Simply use `_('message')` instead of `'message'` and never use f-strings for translatable texts.
    await message.reply(_('Hello, <b>{user}</b>!').format(user=message.from_user.full_name))


@dp.message_handler(commands='lang')
async def cmd_lang(message: types.Message, locale):
    # For setting custom lang you have to modify i18n middleware, like this:
    # https://github.com/aiogram/EventsTrackerBot/blob/master/modules/base/middlewares.py
    await message.reply(_('Your current language: <i>{language}</i>').format(language=locale))

# If you care about pluralization, here's small handler
# And also, there's and example of comments for translators. Most translation tools support them.

# Alias for gettext method, parser will understand double underscore as plural (aka ngettext)
__ = i18n.gettext


# some likes manager
LIKES_STORAGE = {'count': 0}


def get_likes() -> int:
    return LIKES_STORAGE['count']


def increase_likes() -> int:
    LIKES_STORAGE['count'] += 1
    return get_likes()
#


@dp.message_handler(commands='like')
async def cmd_like(message: types.Message, locale):
    likes = increase_likes()

    # NOTE: This is comment for a translator
    await message.reply(__('Aiogram has {number} like!', 'Aiogram has {number} likes!', likes).format(number=likes))

if __name__ == '__main__':
    executor.start_polling(dp, skip_updates=True)