noosfero | Fixes translation issues (!1106)

[Rodrigo Souto]

New comment for Merge Request !1106 on app/helpers/search_helper.rb:

https://gitlab.com/noosfero/noosfero/merge_requests/1106#note_22740318

>      :communities
>    ]
>  
> +  def asset_to_human(asset)
> +    custom_names = {
> +      articles:    _('content')

Typo: contentS


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