application_helper.rb not refreshing after restart server Rails

application_helper.rb not refreshing after restart server Rails

sorry if this is a fool question
I have an app on rails using i18n its fine, until i try to modify the
application_helper.rb there is a part that stands:
def language_css(language)
case language
when 'en'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/en.css">'
when 'es-MX'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/es.css">'
when 'fr'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/fr.css">'
when 'jp'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/jp.css">'
when 'ch'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/ch.css">'
when 'ar'
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/ar.css">'
default
return raw '<link rel="stylesheet" type="text/css"
href="/assets/stylesheets/es.css">'
end
end
I tried to change default "es.css" for "en.css" but i did it , and i see
no changes the es.css file is still the default css file.. not en.css
So i even tried like Ctrl + C and Rails S, several times, no luck
I found an advanced question on Stackoverflow for developing plugins, wich
teach you how to set a refresh of this file always, but this is to
advance, and i just need to refresh this Once!!
Thanks