change ogp image, make sure ogp description is translated

.gitignore

@@ -51,7 +51,7 @@ Temporary Items
 /.cache
 /.sass-cache
 /build
-/data
+/data/courses.yml
 /vendor
 
 # Editor related files

data/ogp/og.yml

+---
 image:
-  '': https://totem-project.org/static/totem-logo.png
-  secure_url: https://totem-project.org/static/totem-logo.png
+  '': https://www-staging.totem-project.org/static/totem-social-share.png
+  secure_url: https://www-staging.totem-project.org/static/totem-social-share.png
   type: image/png
-  width: 600
-  height: 600
+  width: 930
+  height: 497
 title: Totem project
 url: https://totem-project.org
 description: Digital Security training for activists and journalists

data/ogp/twitter.yml

+---
 card: summary
-image: https://totem-project.org/static/totem-logo.png
+image: https://www-staging.totem-project.org/static/totem-social-share.png
 title: Totem project
 description: Digital Security training for activists and journalists

source/pages/index.html.erb

 ---
 ---
+<%% Set translated description for OGP tags %>
+<% current_page.data['description'] = t :intro %>
 <% text_class = config[:locales][I18n.locale][:text_class] %>
 <!-- Header, Call to Action -->
     <header class="masthead">

source/pages/privacy.ar.html.erb

 ---
+description: سياسة الخصوصية
 ---
     <header class="masthead"></header>
     <section id="side-page">

source/pages/privacy.en.html.erb

 ---
+description: Privacy policy
 ---
     <header class="masthead"></header>
     <section id="side-page">

source/pages/privacy.es.html.erb

 ---
+description: Política de privacidad
 ---
     <header class="masthead"></header>
     <section id="side-page">

source/pages/privacy.fa.html.erb

 ---
+description: سیاست محرمانگی
 ---
     <header class="masthead"></header>
     <section id="side-page">

source/pages/privacy.fr.html.erb

 ---
+description: Politique de confidentialité
 ---
     <header class="masthead"></header>
     <section id="side-page">

source/pages/terms.html.erb

 ---
 ---
+<% current_page.data['description'] = t :terms_of_use%>
 <header class="masthead">
 </header>