feat: Translation preparation for accounts app

[marksweb]

This begins the implementation of translation tags as suggested by #1648

Translations tags are added to the accounts templates and gettext added to the placeholders for ProfileForm.

[marksweb]

@bmispelon excellent, I'll keep going through the apps. I've got a PR for agregator open as well. So that matches my thoughts that we end up with a squashed commit for each app that makes their user facing strings ready for languages to be added in.

After I've done each app I'll do Django settings, i18n url patterns and the frontend language selector as a final PR.

I'm not working this week so I imagine I'll get through the lot 🤞

[bmispelon]

This needs fixing after #1676 got merged