Use static list of languages for EmailTemplate.languages
The list of languages in django settings.LANGUAGES
isn't a static list, so, with different versions of Django will have different options for supported languages.
There are two problems with this, 1) There could be some langauges vanishing if one downgrades the django version and also there can be languages that aren't there in Core. 2) There will always be pending migrations with new versions of Django.
We should be using the list of languages that Core supports.
Edited by Abhilash Raj