Merge branch 'move-colon-on-merge-request-notification' into 'master'

Move colon on merge request notification

See merge request gitlab-org/gitlab-ce!30178

app/views/notify/new_merge_request_email.text.erb

 <%= @merge_request.author_name %> <%= 'created a merge request:' %> <%= url_for(project_merge_request_url(@merge_request.target_project, @merge_request)) %>
 
 <%= merge_path_description(@merge_request, 'to') %>
-<%= 'Author' %>:    <%= @merge_request.author_name %>
+<%= 'Author:' %>    <%= @merge_request.author_name %>
 <%= assignees_label(@merge_request) %>
 <%= render_if_exists 'notify/merge_request_approvers', presenter: @mr_presenter %>