* 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>