Updated issuable dropdown titles

Closes #23337

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

@@ -85,20 +85,20 @@
           .issuable-form-select-holder
             - if issuable.assignee_id
               = f.hidden_field :assignee_id
-            = dropdown_tag(user_dropdown_label(issuable.assignee_id, "Assignee"), options: { toggle_class: "js-dropdown-keep-input js-user-search js-issuable-form-dropdown js-assignee-search", title: "Filter by assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee js-filter-submit",
+            = dropdown_tag(user_dropdown_label(issuable.assignee_id, "Assignee"), options: { toggle_class: "js-dropdown-keep-input js-user-search js-issuable-form-dropdown js-assignee-search", title: "Select assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee js-filter-submit",
               placeholder: "Search assignee", data: { first_user: current_user.try(:username), null_user: true, current_user: true, project_id: project.try(:id), selected: issuable.assignee_id, field_name: "#{issuable.class.model_name.param_key}[assignee_id]", default_label: "Assignee", show_menu_above: true } })
       .form-group.issue-milestone
         = f.label :milestone_id, "Milestone", class: "control-label #{"col-lg-4" if has_due_date}"
         .col-sm-10{ class: ("col-lg-8" if has_due_date) }
           .issuable-form-select-holder
-            = render "shared/issuable/milestone_dropdown", selected: issuable.milestone, name: "#{issuable.class.model_name.param_key}[milestone_id]", show_any: false, show_menu_above: true, show_upcoming: false, extra_class: "js-issuable-form-dropdown js-dropdown-keep-input"
+            = render "shared/issuable/milestone_dropdown", selected: issuable.milestone, name: "#{issuable.class.model_name.param_key}[milestone_id]", show_any: false, show_menu_above: true, show_upcoming: false, extra_class: "js-issuable-form-dropdown js-dropdown-keep-input", dropdown_title: "Select milestone"
       .form-group
         - has_labels = issuable.project.labels.any?
         = f.label :label_ids, "Labels", class: "control-label #{"col-lg-4" if has_due_date}"
         = f.hidden_field :label_ids, multiple: true, value: ''
         .col-sm-10{ class: "#{"col-lg-8" if has_due_date} #{'issuable-form-padding-top' if !has_labels}" }
           .issuable-form-select-holder
-            = render "shared/issuable/label_dropdown", classes: ["js-issuable-form-dropdown"], selected: issuable.labels, data_options: { field_name: "#{issuable.class.model_name.param_key}[label_ids][]", show_any: false, show_menu_above: 'true' }
+            = render "shared/issuable/label_dropdown", classes: ["js-issuable-form-dropdown"], selected: issuable.labels, data_options: { field_name: "#{issuable.class.model_name.param_key}[label_ids][]", show_any: false, show_menu_above: 'true' }, dropdown_title: "Select label"
     - if has_due_date
       .col-lg-6
         .form-group

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

@@ -8,6 +8,7 @@
 - classes = local_assigns.fetch(:classes, [])
 - selected = local_assigns.fetch(:selected, nil)
 - selected_toggle = local_assigns.fetch(:selected_toggle, nil)
+- dropdown_title = local_assigns.fetch(:dropdown_title, "Filter by label")
 - dropdown_data = {toggle: 'dropdown', field_name: "label_name[]", show_no: "true", show_any: "true", namespace_path: @project.try(:namespace).try(:path), project_path: @project.try(:path), labels: labels_filter_path, default_label: "Labels"}
 - dropdown_data.merge!(data_options)
 - classes << 'js-extra-options' if extra_options
@@ -23,7 +24,7 @@
       = multi_label_name(selected, "Labels")
     = icon('chevron-down')
   .dropdown-menu.dropdown-select.dropdown-menu-paging.dropdown-menu-labels.dropdown-menu-selectable
-    = render partial: "shared/issuable/label_page_default", locals: { title: "Filter by label", show_footer: show_footer, show_create: show_create }
+    = render partial: "shared/issuable/label_page_default", locals: { title: dropdown_title, show_footer: show_footer, show_create: show_create }
     - if show_create && project && can?(current_user, :admin_label, project)
       = render partial: "shared/issuable/label_page_create"
     = dropdown_loading

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

@@ -2,9 +2,10 @@
 - extra_class = extra_class || ''
 - show_menu_above = show_menu_above || false
 - selected_text = selected.try(:title)
+- dropdown_title = dropdown_title || "Filter by milestone"
 - if selected.present?
   = hidden_field_tag(name, name == :milestone_title ? selected.title : selected.id)
-= dropdown_tag(milestone_dropdown_label(selected_text), options: { title: "Filter by milestone", toggle_class: "js-milestone-select js-filter-submit #{extra_class}", filter: true, dropdown_class: "dropdown-menu-selectable dropdown-menu-milestone",
+= dropdown_tag(milestone_dropdown_label(selected_text), options: { title: dropdown_title, toggle_class: "js-milestone-select js-filter-submit #{extra_class}", filter: true, dropdown_class: "dropdown-menu-selectable dropdown-menu-milestone",
   placeholder: "Search milestones", footer_content: project.present?, data: { show_no: true, show_menu_above: show_menu_above, show_any: show_any, show_upcoming: show_upcoming, field_name: name, selected: selected.try(:title), project_id: project.try(:id), milestones: milestones_filter_dropdown_path, default_label: "Milestone" } }) do
   - if project
     %ul.dropdown-footer-list