Use entypo-mail on mobile view

app/assets/images/fonts/svg-icons/mail_white.svg

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
-<svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
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app/assets/stylesheets/typography.scss

@@ -21,7 +21,3 @@
 .diaspora-custom-compose:before {
   content: 'a';
 }
-
-.diaspora-custom-mail:before {
-  content: 'b';
-}

app/views/layouts/_header.mobile.haml

@@ -16,7 +16,7 @@
         -# Conversations
         %li
           = link_to conversations_path, class: "badge-link", id: "conversations-badge" do
-            %i.diaspora-custom-mail
+            %i.entypo-mail
             - if current_user.unread_message_count > 0
               %span.badge.badge-important#conversation
                 = current_user.unread_message_count