Fix parameterise deprecation warning
Fix parameterise deprecation warning

DEPRECATION WARNING: Passing the separator argument as a positional
parameter is deprecated and will soon be removed. Use `separator: '_'`
instead. (called from followable_translation_key at
/home/travis/build/consul/consul/app/controllers/follows_controller.rb:2
5)

usabi/consul_san_borondon,AyuntamientoPuertoReal/decidePuertoReal,consul/consul,consul/consul,usabi/consul_san_borondon,usabi/consul_san_borondon,consul/consul,consul/consul,AyuntamientoPuertoReal/decidePuertoReal,AyuntamientoPuertoReal/decidePuertoReal,consul/consul,usabi/consul_san_borondon