Make salutation of email localizable (#4454)

app/views/admin_mailer/new_report.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('admin_mailer.new_report.body', target: @report.target_account.acct, reporter: @report.account.acct) %>
 

app/views/notification_mailer/digest.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.digest.body', since: l(@since), instance: root_url) %>
 <% @notifications.each do |notification| %>

app/views/notification_mailer/favourite.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.favourite.body', name: @account.acct) %>
 

app/views/notification_mailer/follow.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.follow.body', name: @account.acct) %>
 

app/views/notification_mailer/follow_request.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.follow_request.body', name: @account.acct) %>
 

app/views/notification_mailer/mention.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.mention.body', name: @status.account.acct) %>
 

app/views/notification_mailer/reblog.text.erb

-<%= display_name(@me) %>,
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
 
 <%= raw t('notification_mailer.reblog.body', name: @account.acct) %>
 

config/locales/en.yml

@@ -215,6 +215,7 @@ en:
       body: "%{reporter} has reported %{target}"
       subject: New report for %{instance} (#%{id})
   application_mailer:
+    salutation: '%{name},'
     settings: 'Change e-mail preferences: %{link}'
     signature: Mastodon notifications from %{instance}
     view: 'View:'