noosfero | Fixes translation issues (!1106)

[Gabriel Silva]

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

https://gitlab.com/noosfero/noosfero/merge_requests/1106#note_22740417

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

I'm pretty sure it should use the singular. For example, in portuguese:

![Screen_Shot_2017-02-03_at_4.49.10_PM](/uploads/d4767d5489fcaa0132262d8b621a2e0c/Screen_Shot_2017-02-03_at_4.49.10_PM.png)


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