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>

app/builders/account_builder.rb

@@ -40,7 +40,7 @@ class AccountBuilder
   end
 
   def create_account
-    @account = Account.create!(name: @account_name)
+    @account = Account.create!(name: @account_name, locale: I18n.locale)
     Current.account = @account
   end