Remove icons from button on wiki pages. Also consistent padding between buttons there

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/builds/index.html.haml

@@ -34,7 +34,6 @@
           = link_to 'Get started with Builds', help_page_path('ci/quick_start', 'README'), class: 'btn btn-info'
 
         = link_to ci_lint_path, class: 'btn btn-default' do
-          = icon('wrench')
           %span CI Lint
 
   %ul.content-list

app/views/projects/milestones/index.html.haml

@@ -6,7 +6,6 @@
   .nav-controls
     - if can?(current_user, :admin_milestone, @project)
       = link_to new_namespace_project_milestone_path(@project.namespace, @project), class: "btn btn-new", title: "New Milestone" do
-        = icon('plus')
         New Milestone
 
 .milestones

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

@@ -23,11 +23,9 @@
         = link_to 'Reopen Milestone', namespace_project_milestone_path(@project.namespace, @project, @milestone, milestone: {state_event: :activate }), method: :put, class: "btn btn-reopen btn-nr btn-grouped"
 
       = link_to edit_namespace_project_milestone_path(@project.namespace, @project, @milestone), class: "btn btn-grouped btn-nr" do
-        = icon('pencil-square-o')
         Edit
 
       = link_to namespace_project_milestone_path(@project.namespace, @project, @milestone), data: { confirm: 'Are you sure?' }, method: :delete, class: "btn btn-grouped btn-danger" do
-        = icon('trash-o')
         Delete
 
 .detail-page-description.milestone-detail

app/views/projects/pipelines/index.html.haml

@@ -28,14 +28,12 @@
     .nav-controls
       - if can? current_user, :create_pipeline, @project
         = link_to new_namespace_project_pipeline_path(@project.namespace, @project), class: 'btn btn-create' do
-          = icon('plus')
           New pipeline
 
         - unless @repository.gitlab_ci_yml
           = link_to 'Get started with Pipelines', help_page_path('ci/quick_start', 'README'), class: 'btn btn-info'
 
         = link_to ci_lint_path, class: 'btn btn-default' do
-          = icon('wrench')
           %span CI Lint
 
   %ul.content-list.pipelines

app/views/projects/wikis/_main_links.html.haml

 - if (@page && @page.persisted?)
-  = link_to namespace_project_wiki_history_path(@project.namespace, @project, @page), class: "btn btn-grouped" do
+  = link_to namespace_project_wiki_history_path(@project.namespace, @project, @page), class: "btn" do
     Page History
   - if can?(current_user, :create_wiki, @project)
-    = link_to namespace_project_wiki_edit_path(@project.namespace, @project, @page), class: "btn btn-grouped" do
-      %i.fa.fa-pencil-square-o
+    = link_to namespace_project_wiki_edit_path(@project.namespace, @project, @page), class: "btn" do
       Edit
   - if can?(current_user, :admin_wiki, @project)
     = link_to namespace_project_wiki_path(@project.namespace, @project, @page), data: { confirm: "Are you sure you want to delete this page?"}, method: :delete, class: "btn btn-remove" do
-      = icon('trash')
       Delete

app/views/projects/wikis/_nav.html.haml

@@ -13,7 +13,6 @@
   .nav-controls
     - if can?(current_user, :create_wiki, @project)
       = link_to '#modal-new-wiki', class: "add-new-wiki btn btn-new", "data-toggle" => "modal" do
-        = icon('plus')
         New Page
 
 = render 'projects/wikis/new'