Handle language on registration email

[jonas-martinez]

No description provided.

[jonas-martinez]

SendGrid does not provide a way to manage language on emails.
The only way to do it from their documentation : https://github.com/sendgrid/email-templates/tree/master/dynamic-templates/different-languages
This is not clean at all and can become unmanageable really fast.

Here is an example with only 2 languages (French & English) on the subject of the mail :

We can see that it is not easily readable, even less readable if we add dozens of languages

[jonas-martinez]

Another way to do that would be to create different versions of a template, each one corresponding to a language. This makes everything clean but the only way to make it work is to activate/deactivate the version you want to use. This is prone to race conditions on version activation.

[jonas-martinez]

@lenra-io/lenra Should we let the server manage languages or should we use the first solution with SendGrid even though this can become unmanageable ? We could find another mail delivery system in the future that handles language properly.

[shiipou]

@lenra-io/lenra Should we let the server manage languages or should we use the first solution with SendGrid even though this can become unmanageable ? We could find another mail delivery system in the future that handles language properly.

I think letting server doing it can be better for open-sourcing the project, but idk if that take more time to develop. In that case, take the simplest way.
Probably using multiple template for each language can do the job better than with the if else.
Create a verification_code_template_fr and a verification_code_template_en to manage languages.