Fixes issue with filter label missing on labels & milestones

app/assets/javascripts/labels_select.js.coffee

@@ -11,7 +11,7 @@ class @LabelsSelect
       newColorField = $('#new_label_color')
       showNo = $dropdown.data('show-no')
       showAny = $dropdown.data('show-any')
-      defaultLabel = $dropdown.text().trim()
+      defaultLabel = $dropdown.data('default-label')
 
       if newLabelField.length
         $('.suggest-colors-dropdown a').on 'click', (e) ->

app/assets/javascripts/milestone_select.js.coffee

@@ -8,7 +8,7 @@ class @MilestoneSelect
       showNo = $dropdown.data('show-no')
       showAny = $dropdown.data('show-any')
       useId = $dropdown.data('use-id')
-      defaultLabel = $dropdown.text().trim()
+      defaultLabel = $dropdown.data('default-label')
 
       $dropdown.glDropdown(
         data: (term, callback) ->

app/assets/javascripts/users_select.js.coffee

@@ -11,7 +11,7 @@ class @UsersSelect
       showAnyUser = $dropdown.data('any-user')
       firstUser = $dropdown.data('first-user')
       selectedId = $dropdown.data('selected')
-      defaultLabel = $dropdown.text().trim()
+      defaultLabel = $dropdown.data('default-label')
 
       $dropdown.glDropdown(
         data: (term, callback) =>

app/views/shared/issuable/_filter.html.haml

@@ -10,13 +10,13 @@
           - if params[:author_id]
             = hidden_field_tag(:author_id, params[:author_id])
           = dropdown_tag(user_dropdown_label(params[:author_id], "Author"), options: { toggle_class: "js-user-search js-filter-submit js-author-search", title: "Filter by author", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-author",
-            placeholder: "Search authors", data: { any_user: "Any Author", first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), selected: params[:author_id], field_name: "author_id" } })
+            placeholder: "Search authors", data: { any_user: "Any Author", first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), selected: params[:author_id], field_name: "author_id", default_label: "Author" } })
 
         .filter-item.inline
           - if params[:assignee_id]
             = hidden_field_tag(:assignee_id, params[:assignee_id])
           = dropdown_tag(user_dropdown_label(params[:assignee_id], "Assignee"), options: { toggle_class: "js-user-search js-filter-submit js-assignee-search", title: "Filter by assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee",
-            placeholder: "Search assignee", data: { any_user: "Any Assignee", first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: (@project.id if @project), selected: params[:assignee_id], field_name: "assignee_id" } })
+            placeholder: "Search assignee", data: { any_user: "Any Assignee", first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: (@project.id if @project), selected: params[:assignee_id], field_name: "assignee_id", default_label: "Assignee" } })
 
         .filter-item.inline.milestone-filter
           = render "shared/issuable/milestone_dropdown"

app/views/shared/issuable/_label_dropdown.html.haml

 - if params[:label_name]
   = hidden_field_tag(:label_name, params[:label_name])
 .dropdown
-  %button.dropdown-menu-toggle.js-label-select.js-filter-submit{type: "button", data: {toggle: "dropdown", field_name: "label_name", show_no: "true", show_any: "true", selected: params[:label_name], project_id: @project.try(:id), labels: labels_filter_path}}
+  %button.dropdown-menu-toggle.js-label-select.js-filter-submit{type: "button", data: {toggle: "dropdown", field_name: "label_name", show_no: "true", show_any: "true", selected: params[:label_name], project_id: @project.try(:id), labels: labels_filter_path, default_label: "Label"}}
     %span.dropdown-toggle-text
-      = h(params[:label_name] || "Label")
+      = h(params[:label_name].presence || "Label")
     = icon('chevron-down')
   .dropdown-menu.dropdown-select.dropdown-menu-paging.dropdown-menu-labels.dropdown-menu-selectable
     .dropdown-page-one

app/views/shared/issuable/_milestone_dropdown.html.haml

 - if params[:milestone_title]
   = hidden_field_tag(:milestone_title, params[:milestone_title])
-= dropdown_tag(h(params[:milestone_name] || "Milestone"), options: { title: "Filter by milestone", toggle_class: 'js-milestone-select js-filter-submit', filter: true, dropdown_class: "dropdown-menu-selectable",
-  placeholder: "Search milestones", footer_content: @project.present?, data: { show_no: true, show_any: true, field_name: "milestone_title", selected: params[:milestone_title], project_id: @project.try(:id), milestones: milestones_filter_dropdown_path } }) do
+= dropdown_tag(h(params[:milestone_title].presence || "Milestone"), options: { title: "Filter by milestone", toggle_class: 'js-milestone-select js-filter-submit', filter: true, dropdown_class: "dropdown-menu-selectable",
+  placeholder: "Search milestones", footer_content: @project.present?, data: { show_no: true, show_any: true, field_name: "milestone_title", selected: params[:milestone_title], project_id: @project.try(:id), milestones: milestones_filter_dropdown_path, default_label: "Milestone" } }) do
   - if @project
     %ul.dropdown-footer-list
       - if can? current_user, :admin_milestone, @project