Use 'branch' icon instead of 'fork'

Show ‘branch’ icon instead of a ‘fork’ icon when branch names are being displayed.

Changelog: changed

app/views/projects/blob/_editor.html.haml

@@ -5,7 +5,7 @@
 .file-holder-bottom-radius.file-holder.file.gl-mb-3
   .js-file-title.file-title.gl-display-flex.gl-align-items-center.clearfix{ data: { current_action: action } }
     .editor-ref.block-truncated.has-tooltip{ title: ref }
-      = sprite_icon('fork', size: 12)
+      = sprite_icon('branch', size: 12)
       = ref
     - if current_action?(:edit) || current_action?(:update)
       %span.float-left.gl-mr-3

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

@@ -4,7 +4,7 @@
 %li{ class: "branch-item js-branch-item js-branch-#{branch.name}", data: { name: branch.name } }
   .branch-info
     .branch-title
-      = sprite_icon('fork', size: 12, css_class: 'gl-flex-shrink-0')
+      = sprite_icon('branch', size: 12, css_class: 'gl-flex-shrink-0')
       = link_to project_tree_path(@project, branch.name), class: 'item-title str-truncated-100 ref-name gl-ml-3 qa-branch-name' do
         = branch.name
       - if branch.name == @repository.root_ref

app/views/projects/merge_requests/_merge_request.html.haml

@@ -33,7 +33,7 @@
           %span.project-ref-path.has-tooltip{ title: _('Target branch') }
              
             = link_to project_ref_path(merge_request.project, merge_request.target_branch), class: 'ref-name' do
-              = sprite_icon('fork', size: 12, css_class: 'fork-sprite')
+              = sprite_icon('branch', size: 12, css_class: 'fork-sprite')
               = merge_request.target_branch
         - if merge_request.labels.any?