feat: Ability to set installation-wide default locale (#1433)

* Dashboard locale can be set via env variable
* Change account locale based on registration page
* Set account locale if available

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

.env.example

@@ -4,6 +4,10 @@ SECRET_KEY_BASE=replace_with_lengthy_secure_hex
 # Replace with the URL you are planning to use for your app
 FRONTEND_URL=http://0.0.0.0:3000
 
+# If the variable is set, all non-authenticated pages would fallback to the default locale.
+# Whenever a new account is created, the default language will be DEFAULT_LOCALE instead of en
+# DEFAULT_LOCALE=en
+
 # If you plan to use CDN for your assets, set Asset CDN Host
 ASSET_CDN_HOST=