Fixes in translations messages

Author: davidsf

app/views/proposals/_commercial_form_fields.html.haml

@@ -1,6 +1,6 @@
 .form-group
   = f.label :url
-  %abbr{title: t('This field is required'} *
+  %abbr{title: t('This field is required')} *
   = f.text_field :url, required: 'required', class: 'form-control'
   %span.help-block
     = t('just-paste')

app/views/proposals/index.html.haml

@@ -51,7 +51,7 @@
 
           %p
             %strong
-              = t)'Why do I need to add more information?')
+              = t('Why do I need to add more information?')
           %p
             = t('The more information you add to your proposal, the more likely it is that the conference organizers accept your proposal.')
             %br