Add user status filter to admin user management page (#16770)

It makes Admin's life easier to filter users by various status.

* introduce window.config.PageData to pass template data to javascript module and small refactor

move legacy window.ActivityTopAuthors to window.config.PageData.ActivityTopAuthors
make HTML structure more IDE-friendly in footer.tmpl and head.tmpl
remove incorrect <style class="list-search-style"></style> in head.tmpl
use log.Error instead of log.Critical in admin user search

* use LEFT JOIN instead of SubQuery when admin filters users by 2fa. revert non-en locale.

* use OptionalBool instead of status map

* refactor SearchUserOptions.toConds to SearchUserOptions.toSearchQueryBase

* add unit test for user search

* only allow admin to use filters to search users

modules/util/util.go

@@ -9,6 +9,7 @@ import (
 	"crypto/rand"
 	"errors"
 	"math/big"
+	"strconv"
 	"strings"
 )
 
@@ -17,7 +18,7 @@ type OptionalBool byte
 
 const (
 	// OptionalBoolNone a "null" boolean value
-	OptionalBoolNone = iota
+	OptionalBoolNone OptionalBool = iota
 	// OptionalBoolTrue a "true" boolean value
 	OptionalBoolTrue
 	// OptionalBoolFalse a "false" boolean value
@@ -47,6 +48,15 @@ func OptionalBoolOf(b bool) OptionalBool {
 	return OptionalBoolFalse
 }
 
+// OptionalBoolParse get the corresponding OptionalBool of a string using strconv.ParseBool
+func OptionalBoolParse(s string) OptionalBool {
+	b, e := strconv.ParseBool(s)
+	if e != nil {
+		return OptionalBoolNone
+	}
+	return OptionalBoolOf(b)
+}
+
 // Max max of two ints
 func Max(a, b int) int {
 	if a < b {