Add Hungarian translation

Fix for #550

add hunagiran to english tabs

Mke body column from  page translations nullable

Fix a typo sorry.

Make migration for set column body nullable, to fix the problem when create a page with no body field.

update PR with the lasted changes

Update Carbon Locale, remove body requirement on pages, minor update to language core en, and update language es.

Tweaked dutch translations

Only show locale drop down if you have more than 1 language on the admin.

updated to lasted

update carbon locale on boot.