General settings page will not load – error message depends on browser

I have not been able to enter General Settings. All other settings pages will load. Chrome displays “no data received” and Firefox displays “server reset” when trying to access General Settings. I tried disabling all plugins and changing themes to no effect.

I am running WordPress on Ubuntu 14.04 with Apache on DigitalOcean.

Next, I tried editing the options-general.php file to see if there was any particular problem code. I found that removing one line from the wp_drop_down_languages array declaration allowed the page to load. The code removed was:

'show_available_translations' => ( ! is_multisite() || is_super_admin() ) && wp_can_install_language_pack(),

Can anyone tell why the site is choking on this code and how to fix it?