Merge branch 'issue_2993' into 'master'

Update copy used in alert message when deleting branches or tags.

Reference: #2993 

Before:

![Screen_Shot_2015-11-19_at_4.10.34_PM](/uploads/5cdf7e8c5d4c6bd9e18584b118420c8c/Screen_Shot_2015-11-19_at_4.10.34_PM.png)

![Screen_Shot_2015-11-19_at_4.14.19_PM](/uploads/80513b96492122860733462efa8c8015/Screen_Shot_2015-11-19_at_4.14.19_PM.png)

After:

![Screen_Shot_2015-11-19_at_4.59.56_PM](/uploads/80367f2acea0d22d36a5297bdc29163e/Screen_Shot_2015-11-19_at_4.59.56_PM.png)

![Screen_Shot_2015-11-19_at_4.59.30_PM](/uploads/134cf02d1fb3feff2159b5659d149d54/Screen_Shot_2015-11-19_at_4.59.30_PM.png)

See merge request !1846

app/views/projects/branches/_branch.html.haml

@@ -26,7 +26,7 @@
           Compare
 
       - if can_remove_branch?(@project, branch.name)
-        = link_to namespace_project_branch_path(@project.namespace, @project, branch.name), class: 'btn btn-grouped btn-xs btn-remove remove-row', method: :delete, data: { confirm: 'Removed branch cannot be restored. Are you sure?'}, remote: true do
+        = link_to namespace_project_branch_path(@project.namespace, @project, branch.name), class: 'btn btn-grouped btn-xs btn-remove remove-row', method: :delete, data: { confirm: "Deleting the '#{branch.name}' branch cannot be undone. Are you sure?" }, remote: true do
           = icon("trash-o")
 
   - if commit

app/views/projects/tags/show.html.haml

@@ -15,7 +15,7 @@
       = render 'projects/tags/download', ref: @tag.name, project: @project
     - if can?(current_user, :admin_project, @project)
       .pull-right
-        = link_to namespace_project_tag_path(@project.namespace, @project, @tag.name), class: 'btn btn-remove remove-row grouped', method: :delete, data: { confirm: 'Removed tag cannot be restored. Are you sure?'} do
+        = link_to namespace_project_tag_path(@project.namespace, @project, @tag.name), class: 'btn btn-remove remove-row grouped', method: :delete, data: { confirm: "Deleting the '#{@tag.name}' tag cannot be undone. Are you sure?" } do
           %i.fa.fa-trash-o
   .title
     %strong= @tag.name