I want to know How to set "Language Selector Drop-Down " required in node form?
I tried to do this via hook_form_alter, but it seems $form['language'] is not created in this hook !
Is there any hook that let me modify language Drop-Down selector?
I found the solution here
You can enable i18n_node module that is included in i18n module. Then: Go to edit the content type (admin/structure/types/manage/page). Open the 'Multilingual settings' tab. Check the 'Require language' checkbox. Done.
Multilingual content must be installed at first and then in content type, Multilingual settings tab will be added