How to automatically translate to another language if msgid and msgstr of a word is not provided in .mo or .po file in django?

I'm using i18n for translating english to hindi language
        ('en', 'English'),
        ('hi', 'Hindi'),

USE_I18N = True
USE_L10N = True
USE_TZ = True

urlpatterns += i18n_patterns(

    # Include urls for mamber
    path('members/', include('member.urls')),

    # Include urls for about us
    path('about-us/', include('about_us.urls')),

i have run
```django-admin makemessage -l hi```
a folder locale/hi/LC_MESSAGES with `````` and ```django.po``` has been created

1. there are few words which i have added in .po file under ```msgid``` and ```msgstr``` for translation
2. there are few words which {% trans %} convert to hindi by itself. (there translation are not added in ```.mo``` ```.po``` file
3. and other words are not getting translated( which i have not added in ```.mo``` ```.po``` file

can i do something like if no translation provided in .mo and .po then it should automatically convert to other language(hindi language).
It is working few few words but not for whole page. 
How can i achieve this.
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