Add titles and improve messages on sidebar menus (#10872)

* ui: add more message on sidebar menus

* add title on the menus
* show some message instead of hide choose bar when have nothing to choose
* add simply filter for each menus
* do same changes in mew_form.tmpl
* remove some unusefull comments in mew_form.tmpl

Signed-off-by: a1012112796 <1012112796@qq.com>

* do review suggestions

* add filter message  on sidebar filter
* change IsIssueWriter to HasIssuesOrPullsWritePermission

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

options/locale/locale_en-US.ini

@@ -824,17 +824,24 @@ ext_issues = Ext. Issues
 ext_issues.desc = Link to an external issue tracker.
 
 issues.desc = Organize bug reports, tasks and milestones.
+issues.filter_assignees = Filter Assignee
+issues.filter_milestones = Filter Milestone
+issues.filter_labels = Filter Label
 issues.new = New Issue
 issues.new.title_empty = Title cannot be empty
 issues.new.labels = Labels
+issues.new.add_labels_title = Apply labels
 issues.new.no_label = No Label
 issues.new.clear_labels = Clear labels
+issues.new.no_items = No items
 issues.new.milestone = Milestone
+issues.new.add_milestone_title = Set milestone
 issues.new.no_milestone = No Milestone
 issues.new.clear_milestone = Clear milestone
 issues.new.open_milestone = Open Milestones
 issues.new.closed_milestone = Closed Milestones
 issues.new.assignees = Assignees
+issues.new.add_assignees_title = Assign users
 issues.new.clear_assignees = Clear assignees
 issues.new.no_assignees = No Assignees
 issues.no_ref = No Branch/Tag Specified